Philips (Now NXP) TDA8588AJ, TDA8588BJ, TDA8588J Schematic [ru]
INTEGRATED CIRCUITS
DATA SH EET
TDA8588J; TDA8588xJ
2
I
C-bus controlled 4 × 50 Watt
power amplifier and multiple
voltage regulator
Product specification 2004 Feb 24
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
amplifier and multiple voltage regulator
FEATURES
Amplifiers
• I2C-bus control
• Can drivea 2 Ω load with a battery voltage of up to 16 V
and a 4 Ω load with a battery voltage of up to 18 V
• DC load detection, open, short and present
• AC load (tweeter) detection
• Programmable clip detect; 1 % or 4 %
• Programmable thermal protection pre-warning
• Independent short-circuit protection per channel
• Low gain line driver mode (20 dB)
• Loss-of-ground and open VPsafe
• All outputs protected from short-circuit to ground, to V
or across the load
• All pins protected from short-circuit to ground
• Soft thermal-clipping to prevent audio holes
• Low battery detection.
Voltage regulators
GENERAL
• I2C-bus control
• Good stability for any regulator with almost any output
capacitor value
• Five voltage regulators (microcontroller, display,
mechanical digital, mechanical drive and audio)
• Choice of non-adjustable 3.3 or 5 V microcontroller
supply (REG2) versions reducing risk of overvoltage
damage
• Choice of non-adjustable 3.3 or 5 V digital signal
processor supply (REG3) versions reducing risk of
overvoltage damage
• Selectable output voltages for regulators 1, 4 and 5
• Low dropout voltage PNP output stages
• High supply voltage ripple rejection
• Low noise for all regulators
• Two power switches (antenna switch and amplifier
switch)
• Regulator 2 (microcontroller supply) operational during
load-dump and thermal shut-down
• Low quiescent current (only regulator 2 is operational)
• Reset output (push-pull output stage)
• Adjustable reset delay time
• Backup functionality.
P
TDA8588J; TDA8588xJ
PROTECTION
• If connection to the battery voltage is reversed, all
regulator voltages will be zero
• Able to withstand voltages at the output of up to 18 V
(supply line may be short-circuited)
• Thermal protection to avoid thermal breakdown
• Load-dump protection
• Regulator outputs protected from DC short-circuit to
ground or to supply voltage
• All regulators protected by foldback current limiting
• Power switches protected from loss-of-ground.
APPLICATIONS
• Boost amplifier and voltage regulator for car radios and
CD/MD players.
GENERAL DESCRIPTION
Amplifiers
The TDA8588 has a complementary quad audio power
amplifier that uses BCDMOS technology. It contains four
amplifiers configured in Bridge Tied Load (BTL) to drive
speakers for front and rear left and right channels. The
2
C-busallowsdiagnosticinformationofeach amplifier and
I
its speaker to be read separately. Both front and both rear
channel amplifiers canbe configuredindependently in line
driver mode with a gain of 20 dB (differential output).
Voltage regulators
The TDA8588 has a multiple output voltage regulator with
two power switches.
The voltage regulator contains the following:
• Four switchable regulators and one permanently active
regulator (microcontroller supply)
• Two power switches with loss-of-ground protection
• A reset output that can be used to communicate with a
microcontroller.
The quiescent current has a very low level of 150 µA with
only regulator 2 active.
2004 Feb 24 2
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
TDA8588J; TDA8588xJ
amplifier and multiple voltage regulator
QUICK REFERENCE DATA
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
Amplifiers
VP1, V
I
q(tot)
P
o(max)
THD total harmonic distortion − 0.01 0.1 %
V
n(o)(amp)
V
n(o)(LN)
Voltage regulators
SUPPLY
V
P
I
q(tot)
VOLTAGE REGULATORS
V
O(REG1)
V
O(REG2)
V
O(REG3)
V
O(REG4)
operating supply voltage 8 14.4 18 V
P2
total quiescent current − 270 400 mA
maximum output power RL=4Ω;VP= 14.4 V;VIN=2V
44 46 − W
RMS square wave
RL=4Ω;VP= 15.2 V;VIN=2V
49 52 − W
RMS square wave
RL=2Ω;VP= 14.4 V;VIN=2V
83 87 − W
RMS square wave
noise output voltage in amplifier mode − 50 70 µV
noise output voltage in line driver mode − 25 35 µV
supply voltage regulator 1, 3, 4 and 5 on 10 14.4 18 V
regulator 2 on 4 −−V
jump starts for t ≤ 10 minutes −−30 V
load dump protection for
−−50 V
t ≤ 50 ms and tr≤ 2.5 ms
overvoltage for shut-down 20 −−V
total quiescent supply current standby mode; VP= 14.4 V − 150 190 µA
output voltage of regulator 1 0.5 mA ≤ IO≤ 400 mA;
selectable via I2C-bus
IB2[D3:D2] = 01 − 8.3 − V
IB2[D3:D2] = 10 − 8.5 − V
IB2[D3:D2] = 11 − 8.7 − V
output voltage of regulator 2 0.5 mA ≤ IO≤ 350 mA
TDA8588J; TDA8588AJ − 5.0 − V
TDA8588BJ − 3.3 − V
output voltage of regulator 3 0.5 mA ≤ IO≤ 300 mA
TDA8588J − 5.0 − V
TDA8588AJ; TDA8588BJ − 3.3 − V
output voltage of regulator 4 maximum current ≥ 1.6 A;
0.5 mA ≤ IO≤ 800 mA;
selectable via I2C-bus
IB2[D7:D5] = 001 − 5.0 − V
IB2[D7:D5] = 010 − 6.0 − V
IB2[D7:D5] = 011 − 7.0 − V
IB2[D7:D5] = 100 − 8.6 − V
2004 Feb 24 3
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
TDA8588J; TDA8588xJ
amplifier and multiple voltage regulator
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
O(REG5)
POWER SWITCHES
V
drop(SW1)
V
drop(SW2)
output voltage of regulator 5 0.5 mA ≤ IO≤ 400 mA;
selectable via I2C-bus
IB1[D7:D4] = 0001 − 6.0 − V
IB1[D7:D4] = 0010 − 7.0 − V
IB1[D7:D4] = 0011 − 8.2 − V
IB1[D7:D4] = 0100 − 9.0 − V
IB1[D7:D4] = 0101 − 9.5 − V
IB1[D7:D4] = 0110 − 10.0 − V
IB1[D7:D4] = 0111 − 10.4 − V
IB1[D7:D4] = 1000 − 12.5 − V
IB1[D7:D4] = 1001 − VP−1− V
dropout voltage of switch 1 IO= 400 mA − 0.6 1.1 V
dropout voltage of switch 2 IO= 400 mA − 0.6 1.1 V
ORDERING INFORMATION
TYPE NUMBER
TDA8588J DBS37P plastic DIL-bent-SIL power package;
TDA8588AJ 5 V 3.3 V
TDA8588BJ 3.3 V 3.3 V
Note
1. Permanent output voltage of regulator 2 and output voltage of regulator 3, respectively.
NAME DESCRIPTION VERSION REGULATOR 2 REGULATOR 3
37 leads (lead length 6.8 mm)
PACKAGE OUTPUT VOLTAGE
SOT725-1 5 V 5 V
(1)
2004 Feb 24 4
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
amplifier and multiple voltage regulator
BLOCK DIAGRAM
BUCAP
36
BACKUP
SWITCH
35
V
P
TDA8588
ENABLE
LOGIC
V
reg2
REFERENCE
VOLTAGE
REGULATOR 2
TEMPERATURE &
LOAD DUMP
PROTECTION VOLTAGE
REGULATOR
REGULATOR 1
REGULATOR 3
REGULATOR 4
REGULATOR 5
SWITCH 1
TDA8588J; TDA8588xJ
37
REG2
30
REG1
31
REG3
33
REG4
34
REG5
29
SW1
RESCAP
SDA
SCL
STB
IN1
IN2
IN3
IN4
28
2
4
22
STANDBY/ MUTE
11
15
12
14
V
P
40 µs
I2C-BUS
INTERFACE
MUTE
MUTE
MUTE
MUTE
10
13
SGNDSVR
16 8
ACGND
SWITCH 2
CLIP DETECT/ DIAGNOSTIC
26 dB/
20 dB
PROTECTION/
DIAGNOSTIC
26 dB/
20 dB
PROTECTION/
DIAGNOSTIC
26 dB/
20 dB
PROTECTION/
DIAGNOSTIC
26 dB/
20 dB
PROTECTION/
DIAGNOSTIC
TEMPERATURE & LOAD
DUMP PROTECTION
AMPLIFIER
1 18 24
PGND1 PGND3
PGND2/TAB
PGND4
27
SW2
26
RST
32
GND
20
V
P1
6
V
P2
25
DIAG
9
OUT1+
7
OUT1−
17
OUT2+
19
OUT2−
5
OUT3+
3
OUT3−
21
OUT4+
23
OUT4−
mdb586
Fig.1 Block diagram.
2004 Feb 24 5
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
TDA8588J; TDA8588xJ
amplifier and multiple voltage regulator
PINNING
SYMBOL PIN DESCRIPTION
PGND2/TAB 1 power ground 2 and connection for heatsink
SDA 2 I2C-bus data input and output
OUT3− 3 channel 3 negative output
SCL 4 I2C-bus clock input
OUT3+ 5 channel 3 positive output
V
P2
OUT1− 7 channel 1 negative output
PGND1 8 power ground 1
OUT1+ 9 channel 1 positive output
SVR 10 half supply voltage filter capacitor
IN1 11 channel 1 input
IN3 12 channel 3 input
SGND 13 signal ground
IN4 14 channel 4 input
IN2 15 channel 2 input
ACGND 16 AC ground
OUT2+ 17 channel 2 positive output
PGND3 18 power ground 3
OUT2− 19 channel 2 negative output
V
P1
OUT4+ 21 channel 4 positive output
STB 22 standby or operating or mute mode select input
OUT4− 23 channel 4 negative output
PGND4 24 power ground 4
DIAG 25 diagnostic and clip detection output, active LOW
RST 26 reset output
SW2 27 antenna switch; supplies unregulated power to car aerial motor
RESCAP 28 reset delay capacitor
SW1 29 amplifier switch; supplies unregulated power to amplifier(s)
REG1 30 regulator 1 output; supply for audio part of radio and CD player
REG3 31 regulator 3 output; supply for signal processor part (mechanical digital) of CD player
GND 32 combined voltage regulator, power and signal ground
REG4 33 regulator 4 output; supply for mechanical part (mechanical drive) of CD player
REG5 34 regulator 5 output; supply for display part of radio and CD player
V
P
BUCAP 36 connection for backup capacitor
REG2 37 regulator 2 output; supply voltage to microcontroller
6 power supply voltage 2 to amplifier
20 power supply voltage 1 to amplifier
35 power supply to voltage regulator
2004 Feb 24 6
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
amplifier and multiple voltage regulator
PGND2/TAB
ACGND
RESCAP
SDA
OUT3−
SCL
OUT3+
V
P2
OUT1−
PGND1
OUT1+
SVR
IN1
IN3
SGND
IN4
IN2
OUT2+
PGND3
OUT2−
V
P1
OUT4+
STB
OUT4−
PGND4
DIAG
RST
SW2
SW1
REG1
REG3
GND
REG4
REG5
V
BUCAP
REG2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
P
36
37
TDA8588J; TDA8588xJ
TDA8588
001aaa258
Fig.2 Pin configuration.
2004 Feb 24 7
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
amplifier and multiple voltage regulator
FUNCTIONAL DESCRIPTION
The TDA8588 is a multiple voltage regulator combined
withfour independent audiopoweramplifiers configured in
bridge tied load with diagnostic capability. The output
voltages of all regulators except regulators 2 and 3 can be
controlledvia the I2C-bus.However, regulator 3 canbeset
to 0 V via the I2C-bus. The output voltage of regulator 2
(microcontroller supply) and the maximum output voltage
of regulator 3 (mechanical digital and microcontroller
supplies) can bothbe either5 V or 3.3 V depending on the
type number. The maximum output voltages of both
regulators are fixed to avoid any risk of damaging the
microcontroller that may occur during a disturbance of the
I2C-bus.
The amplifier diagnostic functions give information about
output offset, load, or short-circuit. Diagnostic functions
are controlled via the I2C-bus. The TDA8588 is protected
against short-circuit, over-temperature, open ground and
open VP connections. If a short-circuit occurs at the input
or output of a single amplifier, that channel shuts down,
and the other channels continue to operate normally. The
channel that has a short-circuit can be disabled by the
microcontroller via the appropriate enable bit of the
I2C-bus to prevent any noise generated by the fault
condition from being heard.
TDA8588J; TDA8588xJ
Power-on reset and supply voltage spikes (see Fig.13
and Fig.14)
If the supply voltage drops too low to guarantee the
integrity of the data in the I2C-bus latches, the power-on
reset cycle will start. All latches will be setto a pre-defined
state, pin DIAG will be pulled LOW to indicate that a
power-on reset has occurred, and bit D7 of data byte 2 is
also set for the same reason. When D0 of instruction
byte 1 is set, the power-on flag resets, pin DIAG is
released and the amplifier will then enter its start-up cycle.
Diagnostic output
Pin DIAG indicates clipping, thermal protection
pre-warning of amplifier and voltage regulator sections,
short-circuit protection, low and high battery voltage.
Pin DIAGisan open-drain output, isactiveLOW, and must
beconnected to anexternal voltage via an external pull-up
resistor. If a failure occurs, pin DIAG remains LOW during
the failure and no clipping information is available. The
microcontroller can read the failure information via the
I2C-bus.
AMPLIFIERS
Muting
Start-up
At power on, regulator 2 will reach its final voltage when
thebackupcapacitor voltage exceeds 5.5 V independently
of the voltageon pin STB. When pin STB isLOW, the total
quiescent current is low, and the I2C-bus lines are high
impedance.
When pin STB is HIGH, the I2C-bus is biased on and then
the TDA8588 performs a power-on reset. When bit D0 of
instruction byte IB1 is set, the amplifier is activated, bit D7
of data byte 2 (power-on reset occurred) is reset, and
DIAG is no longer held LOW.
pin
Start-up and shut-down timing (see Fig.12)
Acapacitorconnectedto pin SVR enables smooth start-up
and shut-down, preventing the amplifier from producing
audible clicks at switch-on or switch-off. The start-up and
shut-down times can be extended by increasing the
capacitor value.
If the amplifier is shut down using pin STB, the amplifier is
muted, the regulators and switches are switched off, and
the capacitor connected to pin SVR discharges. The low
currentstandbymode is activated 2 secondsafterpin STB
goes LOW.
Ahard mute anda soft mute canboth be performedviathe
I2C-bus. A hard mute mutes the amplifier within 0.5 ms. A
soft mute mutes the amplifier within 20 ms and is less
audible. A hard mute is also activated if a voltage of 8 V is
applied to pin STB.
Temperature protection
If the average junction temperature rises to a temperature
value that has been set via the I2C-bus, a thermal
protectionpre-warningisactivatedmakingpin DIAGLOW.
If the temperature continues to rise, all four channels will
be muted to reduce the output power (soft thermal
clipping). The valueat whichthe temperature mute control
activates is fixed; only the temperature at which the
thermal protection pre-warning signal occurs can be
specified by bit D4 in instruction byte 3. If implementing
thetemperature mute controldoes not reducethe average
junction temperature, allthe power stageswill beswitched
off (muted) at the absolute maximum temperature T
Offset detection
Offset detection can only be performed when there is no
input signal to the amplifiers, for instance when the
external digital signal processor is muted after a start-up.
The output voltage of each channel is measured and
j(max)
.
2004 Feb 24 8
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
amplifier and multiple voltage regulator
compared with areference voltage.If the output voltage of
a channel is greater than the reference voltage, bit D2 of
the associated data byte is set and read by the
microcontroller during a read instruction. Note that the
value of this bit is only meaningful when there is no input
signal and the amplifier is not muted. Offset detection is
always enabled.
Speaker protection
If one side of a speaker is connected to ground, a missing
current protection is implemented to prevent damage to
the speaker. A fault condition is detected in a channel
whenthereis a mismatch betweenthepowercurrent in the
high side and the power current in the low side; during a
fault condition the channel will be switched off.
The load status of each channel can be read via the
2
I
C-bus: short to ground (one side of the speaker
connected to ground), short to VP(one side of the speaker
connected to VP), and shorted load.
Line driver mode
TDA8588J; TDA8588xJ
AC-LOAD DETECTION
AC-load detection can be used to detect that AC-coupled
speakers are connected correctly during assembly. This
requires at least 3 periods of a 19 kHz sine wave to be
applied to the amplifier inputs. The amplifier produces a
peak output voltage which also generates a peak output
current through the AC-coupledspeaker. The 19 kHz sine
wave is alsoaudible during the test. Ifthe amplifier detects
three current peaks that are greater than 550 mA, the
AC-load detection bit D1 of instruction byte IB1 is set to
logic 1. Three current peaks are counted to avoid false
AC-load detection which can occur if the input signal is
switchedon and off. Thepeakcurrent counter can bereset
by setting bit D1 of instruction byte IB1 to logic 0.
To guarantee AC-load detection, an amplifier current of
more than 550 mA is required. AC-load detection will
never occur with a current of less than 150 mA. Figure 3
shows which AC loads are detected at different output
voltages. For example, if a load is detected at an output
voltage of 2.5 V peak, the load is less than 4 Ω. If no load
is detected, the output impedance is more than 14 Ω.
An amplifier can be used as a line driver by switching it to
low gain mode. In normal mode, the gain between
single-endedinput and differentialoutput (across theload)
is 26 dB. In low gain mode the gain between single-ended
input and differential output is 20 dB.
Input and AC ground capacitor values
The negative inputs to all four amplifier channels are
combined at pin ACGND. To obtain the best performance
for supply voltage ripple rejection and unwanted audible
noise, the value ofthe capacitor connected to pin ACGND
must be as close as possible to 4 times the value of the
input capacitor connected to the positive input of each
channel.
Load detection
DC-LOAD DETECTION
When DC-load detection is enabled, during the start-up
cycle,aDC-offset is appliedslowlytothe amplifier outputs,
andthe output currentsare measured. If theoutput current
of an amplifier rises above a certain level, it is assumed
that there is a load of less than 6 Ω and bit D5 is reset in
the associated data byte register to indicate that a load is
detected.
V
o(peak)
mrc331
2
10
Z
o(load)
(Ω)
10
1
0107.52.5 5
(1) I
(2) I
O(peak)
O(peak)
= < 150 mA.
= > 550 mA.
no load present
undefined
(1)
(2)
load present
Fig.3 Tolerance of AC-load detection as a
function of output voltage.
(V)
Because the offset is measured during the amplifier
start-upcycle, detection isinaudibleand can beperformed
every time the amplifier is switched on.
2004 Feb 24 9
LOAD DETECTION PROCEDURE
1. At start-up, enable the AC- or DC-load detection by
setting D1 of instruction byte 1 to logic 1.
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
amplifier and multiple voltage regulator
2. After 250 ms the DC load is detected and the mute is
released. This is inaudible and can be implemented
each time the IC is powered on.
3. When the amplifier start-up cycle is completed (after
1.5 s), apply an AC signal to the input, and DC-load
bits D5of each databyte should be readand stored by
the microcontroller.
4. After at least 3 periods of the input signal, the load
statuscan be checkedby reading AC-detectbits D4 of
each data byte.
The AC-load peak current counter can be reset by
settingbit D1 of instructionbyte IB1to logic 0 and then
to logic 1. Note that this will also reset the DC-load
detection bits D5 in each data byte.
Low headroom protection
The normal DC output voltage ofthe amplifieris set to half
the supply voltage and is related to the voltage on
pin SVR. An external capacitor is connected to pin SVR to
suppress power supply ripple. If the supply voltage drops
(at vehicle engine start), the DC output voltage will follow
slowly due to the affect of the SVR capacitor.
TDA8588J; TDA8588xJ
The headroom voltage is the voltage required for correct
operation of the amplifier and is defined as the voltage
difference between the level of the DC output voltage
before the VP voltage drop and the level of VP after the
voltage drop (see Fig.4).
Ata certain supplyvoltage drop, the headroom voltagewill
be insufficient for correct operation of the amplifier. To
prevent unwanted audible noises at the output, the
headroom protection mode will be activated (see Fig.4).
This protection discharges the capacitors connected to
pins SVR and ACGND to increase the headroom voltage.
V
(V)
14
8.4
7
V
P
SVR voltage
vehicle engine start
headroom voltage
amplifier
DC output voltage
t (sec)
mdb515
Fig.4 Amplifier output during supply voltage.
2004 Feb 24 10
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
amplifier and multiple voltage regulator
VOLTAGE REGULATORS
The voltage regulator section contains:
• Four switchable regulators and one permanent active
regulator
• Two power switches with loss-of-ground protection
• Reset push-pull output
• Backup functionality.
The quiescent current condition has a very low current
level of 150 µA typical with only regulator 2 active. The
TDA8588 uses low dropout voltage regulators for use in
low voltage applications.
All of the voltage regulators except for the standby
regulator can be controlled via the I
regulator section of this device has two power switches
which are capable of delivering unregulated 400 mA
continuous current, and has several fail-safe protection
modes. It conforms to peak transient tests and protects
against continuous high voltage (24 V), short-circuits and
thermal stress. A reset warning signal is asserted if
regulator 2 is out of regulation. Regulator 2 will try to
maintain output for as long as possible even if a thermal
shut-down or any other fault condition occurs. During
overvoltage stress conditions, all outputs except
regulator 2 will switch off and the device will be able to
supply a minimum current for an indefinite amount of time
sufficient for powering the memory of a microcontroller.
Provision is made for an external reserve supply capacitor
to be connected to pin BUCAP which can store enough
energy to allow regulator 2 to supply a microcontroller for
a period long enough for it to prepare for a loss-of-voltage.
2
C-bus. The voltage
TDA8588J; TDA8588xJ
Backup capacitor
The backup capacitor is used as a backup supply for the
regulator 2 output when the battery supply voltage (VP)
cannot support the regulator 2 voltage.
Backup function
The backup function is implemented by a switch function,
which behaves like an ideal diode between pins V
and BUCAP; the forward voltage of this ideal diode
depends on the current flowing through it. The backup
function supplies regulator 2 during brief periods when no
supply voltage is present on pin VP. It requires an external
capacitor to be connected to pin BUCAP and ground.
When the supply voltage is present on pin VP this
capacitorwill be charged toalevel of VP− 0.3 V.When the
supply voltage is absent from pin VP, this charge can then
be used to supply regulator 2 for a brief period (t
calculated using the formula:
t
backup
C
backupRL
Example: VP= 14.4 V, V
C
= 100 µF provides a t
backup
VPV
××=
---------------------------------------------------------
O(REG2)
OREG2()
V
O REG2()
= 5 V, RL=1kΩ and
of 177 ms.
backup
When an overvoltage condition occurs, the voltage on
pin BUCAP is limited to approximately 24 V; see Fig.5.
P
)
backup
0.5–()–
Regulator 2
Regulator 2 is intended to supply the microcontroller and
has a low quiescent current. This supply cannot be shut
down in response to overvoltage stress conditions, and is
notI2C-buscontrollableto prevent the microcontroller from
being damaged byovervoltage which couldoccur during a
disturbance of the I2C-bus. This supply will not shut down
during load dump transients or during a high
thermal-protection condition.
2004 Feb 24 11
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
amplifier and multiple voltage regulator
V
t
backupCbackup
(V)
VPV
– 0.5–
OREG2()
×=
----------------------------------------------------
I
L
V
P
V
BUCAP
V
O(REG2)
t
backup
Fig.5 Backup capacitor function.
TDA8588J; TDA8588xJ
out of regulation
t (sec)
mdb512
Reset output
A reset pulse is generated at pin RST when the output
voltage of regulator 2 rises above the reset threshold
value. The reset output is a push-pull output that both
sources and sinks current. The output voltage can switch
between ground and V
regulator 2voltageor V
, and operates at a low
O(REG2)
.TheRSTsignal is controlled
BUCAP
by a low-voltage detection circuit which, when activated,
pulls pin RST LOW (reset active) when V
≤ V
th(rst)
. If V
O(REG2)
≥ V
, pin RST goes HIGH. The
th(rst)
O(REG2)
is
reset pulse is delayed by 40 µs internally. To extend the
delay and toprevent oscillations occurringat thethreshold
voltage, an external capacitor can be connected to
pin RESCAP. Note that a reset pulse is not generated
when V
falls below the reset threshold value.
O(REG2)
Reset delay capacitor
A Reset Delay Capacitor (RDC) connected to
pin RESCAPcan be usedto extend thedelay period of the
reset pulse and to ensure that a clean reset signal is sent
to the microcontroller. The RDC is charged by a current
source. The reset output (pin RST) will be released
(pin RST goes HIGH) when the RDC voltage crosses the
RDC threshold value.
Power switches
There are twopower switchesthat provide an unregulated
DC voltage output for amplifiers and an aerial motor
respectively. The switches have internal protection for
over-temperature conditions and are activated by setting
bits D2 and D3 of instruction byte IB1 to logic 1. The
regulated outputs will supply pulsed current loads that can
contaminate the line with high frequency noise, so it is
important to prevent any cross-coupling between the
regulated outputs, particularly with the 8.3 V audio supply,
and the unregulated outputs.
In the ON state, the switcheshave alow impedance to the
battery voltage. When the battery voltage is higher than
22 V, the switches are switched off. When the battery
voltage is below 22 V the switches are set to their original
condition.
2004 Feb 24 12
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
amplifier and multiple voltage regulator
Protection
All regulator and switch outputs are fully protected by
foldback current limiting against load dumps and
short-circuits; see Fig.6. During a load dump all regulator
outputs, except the output of regulator 2, will go low.
The power switches can withstand ‘loss-of-ground’. This
means that if pin GND becomes disconnected, the switch
is protected by automatically connecting its outputs to
ground.
handbook, full pagewidth
V
O(REGn)
TDA8588J; TDA8588xJ
Temperature protection
If the junction temperature of a regulator becomes too
high, the amplifier(s) are switched off to prevent unwanted
noise signals being audible. A regulator junction
temperature that istoo high is indicated bypin
LOW and is also indicated by setting bit D6 in data byte 2.
If the junction temperature of the regulator continues to
rise and reaches the maximum temperature protection
level, all regulators and switches will be disabled except
regulator 2.
DIAG going
I
sc
I
limit
Fig.6 Foldback current protection.
I
O(REGn)
MDB513
2004 Feb 24 13
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
TDA8588J; TDA8588xJ
amplifier and multiple voltage regulator
I2C-BUS SPECIFICATION
handbook, halfpage
MSB
1
1 0 1 1 0 0 R/W
Fig.7 Address byte.
If address byte bit R/W = 0, the TDA8588 expects 3 instruction bytes: IB1, IB2 and IB3; see Table 1 to Table 6.
After a power-on, all instruction bits are set to zero.
If address byte bit R/W = 1, the TDA8588 will send 4 data bytes to the microcontroller: DB1, DB2, DB3 and DB4; see
Table 7 to Table 10.
0 = write
1 = read
LSB
MDB516
SDA
SCL
S
START condition
Fig.8 Definition of start and stop conditions.
SDA
SCL
data line
stable;
data valid
change
of data
allowed
P
STOP condition
MBA607
SDA
SCL
MBA608
Fig.9 Bit transfer.
2004 Feb 24 14
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
amplifier and multiple voltage regulator
I2C-WRITE
SCL
SDA
SCL
SDA
SAAAP
2
I
C-READ
12 78912 789
MSB − 1
MSB
ADDRESS WRITE DATA
12 78912 789
MSB MSB − 1 MSB MSB − 1 LSB + 1 LSBLSB + 1
LSB + 1
ACK
W
ACK
TDA8588J; TDA8588xJ
MSB MSB − 1 LSB + 1 LSB
To stop the transfer, after the last acknowledge (A)
a stop condition (P) must be generated
ACK
ACK
S
: generated by master (microcontroller)
: generated by slave (TDA8588)
: start
S
: stop
P
: acknowledge
A
: read / write
R/W
ADDRESS
R
READ DATA
To stop the transfer, the last byte must not be acknowledged
Fig.10 I2C-bus read and write modes.
AP
and a stop condition (P) must be generated
mce641
2004 Feb 24 15
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
amplifier and multiple voltage regulator
Table 1 Instruction byte IB1
BIT DESCRIPTION
D7 regulator 5 output voltage control
D6
D5
D4
D3 SW2 control
D2 SW1 control
D1 AC- or DC-load detection switch
D0 amplifier start enable (clear power-on reset
Table 2 Regulator 5 (display) output voltage control
D7 D6 D5 D4
(see Table 2)
0 = SW2 off
1 = SW2 on
0 = SW1 off
1 = SW1 on
0 = AC- or DC-load detection off; resets
DC-load detection bits and AC-load
detection peak current counter
1 = AC- or DC-load detection on
flag; D7 of DB2)
0 = amplifier OFF; pin
1 = amplifier ON; when power-on occurs,
bit D7 of DB2 is reset and pin DIAG is
released
BIT
00000 (off)
00016.0
00107.0
00118.2
01009.0
01019.5
011010.0
011110.4
100012.5
1001≤ VP− 1
DIAG remains LOW
OUTPUT (V)
(switch)
TDA8588J; TDA8588xJ
Table 3 Instruction byte IB2
BIT DESCRIPTION
D7 regulator 4 output voltage control (see
D6
D5
D4 regulator 3 (mechanical digital) control
D3 regulator 1 output voltage control (see
D2
D1 soft mute all amplifier channels (mute delay
D0 hard mute all amplifier channels (mute delay
Table 4 Regulator 4 (mechanical drive) output voltage
D7 D6 D5
Table 5 Regulator 1 (audio) output voltage control
D3 D2
Table 4)
0 = regulator 3 off
1 = regulator 3 on
Table 5)
20 ms)
0 = mute off
1 = mute on
0.4 ms)
0 = mute off
1 = mute on
control
BIT
OUTPUT (V)
0 0 0 0 (off)
0015
0106
0117
1008.6
BIT
OUTPUT (V)
0 0 0 (off)
0 1 8.3
1 0 8.5
1 1 8.7
2004 Feb 24 16
Philips Semiconductors Product specification
I2C-bus controlled 4 × 50 Watt power
TDA8588J; TDA8588xJ
amplifier and multiple voltage regulator
Table 6 Instruction byte IB3 Table 7 Data byte DB1
BIT DESCRIPTION
D7 clip detection level
0 = 4 % detection level
1 = 1 % detection level
D6 amplifier channels 1 and 2 gain select
0 = 26 dB gain (normal mode)
1 = 20 dB gain (line driver mode)
D5 amplifier channels 3 and 4 gain select
0 = 26 dB gain (normal mode)
1 = 20 dB gain (line driver mode)
D4 amplifier thermal protection pre-warning
0 = warning at 145 °C
1 = warning at 122 °C
D3 disable channel 1
0 = enable channel 1
1 = disable channel 1
D2 disable channel 2
0 = enable channel 2
1 = disable channel 2
D1 disable channel 3
0 = enable channel 3
1 = disable channel 3
D0 disable channel 4
0 = enable channel 4
1 = disable channel 4
BIT DESCRIPTION
D7 amplifier thermal protection pre-warning
0 = no warning
1 = junctiontemperatureabovepre-warning
level
D6 amplifier maximum thermal protection
0 = junction temperature below 175 °C
1 = junction temperature above 175 °C
D5 channel 4 DC load detection
0 = DC load detected
1 = no DC load detected
D4 channel 4 AC load detection
0 = no AC load detected
1 = AC load detected
D3 channel 4 load short-circuit
0 = normal load
1 = short-circuit load
D2 channel 4 output offset
0 = no output offset
1 = output offset
D1 channel 4 VP short-circuit
0 = no short-circuit to V
1 = short-circuit to V
D0 channel 4 ground short-circuit
0 = no short-circuit to ground
1 = short-circuit to ground
P
P
2004 Feb 24 17
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