ST L9825 User Manual
L9825
1
2
3
4
5
6
7
8
Octal Low-side Driver For Resistive and Inductive Loads With
Serial / Parallel Input Control, Output Protection and Diagnostic
■ OUTPUTS CURRENT CAPABILITY UP TO
1A, R
■ PARALLEL CONTROL INPUTS FOR
OUTPUTS 1 AND 2
■ SPI CONTROL FOR OUTPUTS 1 TO 8
■ RESET FUNCTION WITH RESET SIGNAL AT
NRES PIN OR UNDERVOLTAGE AT V
■ INTRINSIC OUTPUT VOLTAGE CLAMPING
AT TYP. 50V
■ OVERCURRENT SHUTDOWN AT OUTPUTS
1 TO 6
■ SHORT CIRCUIT CURRENT LIMITATION
AND SELECTIVE THERMAL SHUTDOWN AT
OUTPUTS 7 AND 8
■ OUTPUT STATUS DATA AVAILA BLE ON THE
SPI
≤ 0,75Ω AT TJ = 25°C
ON
CC
PowerSO20
ORDERING NUMBER: L9825
DESCRIPTION
L9825 is a Octal Low-Side Driver Circuit, dedicated
for automotive applications. Output voltage clamping
is provided for flyback current recirculation, when inductive loads are driven. Chip Select and Serial Peripheral Interface for outputs control and diagnostic
data transfer. Parallel Control inputs for two outputs.
BLOCK DIAGRAM
April 2003
NON1
NON2
NCS
CLK
SDI
SDO
nRES
V
CC
V
CC
V
CC
V
V
CC
CC
Q1
Diag1
Q2
Diag2
SPI
Interface
Shift Register
V
CC
Reset
Undervoltage
RESET
V
CC
V
CC
Outpu t Latc h
GND
Diag1
Diag2
Diag3
Diag4
Diag5
Diag6
Diag7
Diag8
Reset
1
2
Q1
Q2
Q3
Q4
Q5
Q6
Q7
Q8
3
S
Fault Latch
Q3
Diag3
Q4
Diag4
Q5
Diag5
Q6
Diag6
Q7
Diag7
Q8
Diag8
Latch / Driver
S
Latch / Driver
S
Latch / Driver
Current Control
R
Overtemperature Detection
R
+
-
V
DG
R
+
-
V
DG
+
-
V
DG
I
CH1
CH2
I
CH3
CH4
CH5
CH6
I
CH7
CH8
OUT
OL
OUT
OUT
OL
OUT
OUT
OUT
OUT
OL
OUT
1/11
L9825
PIN CONNECTION
(Top view)
GND GND
NON1 NCS
SDO
OUT1
OUT3
OUT5
OUT7
SDI
CLK
GND
1
2
3
4
5
6
7
8
9
POWSO20
PIN DESCRIPTION
N° Pin Function
1 GND device ground
2 NON1 control input 1
3 SDO ser ial data outpu t
20
19
18
17
16
15
14
13
12
11
nRes
OUT8
OUT6
OUT4
OUT2
Vcc
NON2
GND10
4 Out 1 output 1
5 Out 3 output 3
6 Out 5 output 5
7 Out 7 output 7
8 SDI serial data input
9 CLK serial clock
10 GND device ground
11 GND device ground
12 NON2 control input 2
13 V
CC
supply voltage
14 Out 2 output 2
15 Out 4 output 4
16 Out 6 output 6
17 Out 8 output 8
18 nR es asynchronous nRes
19 NCS chip select (active low)
20 GND device ground
2/11
ABSOLUTE MAXIMUM RATINGS
For voltages and currents applied externally to the device:
Symbol Parameter Value Unit
L9825
V
CC
Supply voltage -0.3 to 7 V
Inputs and data lines (NONx, NCS, CLK, SDI, nRes)
V
IN
V
IN
I
IN
Voltage (NONx, NCS, CLK, SDI) -0.3 to 7 V
Voltage (nRes) -0.3 to 7 V
Protection diodes current
1)
-20 to 20 mA
(T ≤ 1ms)
Outputs (Out1 ... Out8)
V
OUTc
I
OUT
E
OUTcl
Notes: 1. All inputs are prot ected against ESD according to MIL 883C; tested with HB M at 2KV. It corresponds to a di ss i pated energy
Continuous output voltage -1.0 to 45 V
Output current
Output clamp energy (I
E ≤ 0,2mJ.
2. Transient pulses in accordance to DIN40839 part 1, 3 and ISO 7637 Part 1, 3.
2)
≤ 0.5A) 20 mJ
OUT
-3 to 2.05 A
For currents determined within the device:
Outputs (Out1 ... Out8)
I
OUT
I
OUT
Output current (Out1 ... Out6) 2.05 A
Output current (Out7, Out8) 1.75 A
Total average-current all outputs
3. When operating t he device with short circui t a t m ore than 2 outputs at the sam e time, damage due to elect rical overstress may
occur.
3)
4.5 (Min.) A
THERMAL DATA
Symbol Parameter Value Unit
Thermal shutdown
T
JSC
Thermal shutdown threshold Min.
Thermal resistance
R
thjc-one
R
thjc-all
Single output (junction case) Max. 13 °C/W
All outputs (junction case) Max. 1.6 °C/W
Typ.
150
165
°C
°C
3/11
L9825
ELECTRICAL CHARACTERISTCS
(4.5V ≤ VCC ≤ 5.5V; -40°C ≤ TJ ≤ 150°C; unless otherwise specified)
Symbol Parameter Test Condition Min. Typ. Max. Unit
Supply voltage
I
ccSTB
I
ccOPM
∆I
Standby current without load 5 mA
Operating mode I
∆ICC during reverse output
CC
current
Inputs (NONx. NCS, CLK, SDI, nRes)
V
V
V
R
C
Low level -0.3
INL
High level
INH
Hysteresis voltage 0.85 V
hyst
I
Input current VIN = V
IN
Pullup resistance 50 250 kΩ
IN
Input capacitanc e 10 pF
IN
Serial data outputs
V
SDOH
V
SDOL
I
SDOL
High output level I
Low output level I
Tristate leakage current NCS = high; 0V ≤ V
OUT1 ... 8
= 500mA
5mA
SPI - CLK = 3MHz
NCS = LOW
SDO no load
I
= -3A 100 mA
out
0.2·V
CC
0.7·V
CC
CC
= -4mA
SDO
= 3,2mA 0.4 V
SDO
≤ V
SDO
CC
VCC -0.4
-10 10 µA
VCC+0.3
10 µA
V
V
V
C
Output capacitance f
SDO
Outputs OUT 1 ... 8
I
OUTL1 - 8
I
OUTL1 - 8
I
OUTL1 - 8
V
R
DSon
C
Leakage current OUTx = OFF; V
Leakage current OUTx = OFF; V
Leakage current OUTx = OFF; V
Output clamp voltage 1mA ≤ I
clp
On resistance OUT 1 ... 8 I
Output capacitance V
OUT
Outputs short circuit protection
I
SBC
I
t
SCB
Overcurrent shutoff threshold OUT1 ... OUT6 1.05 1.4 2.05 A
Short circuit current limitation OUT7; OUT8 1.05 1.4 1.75 A
LIM
Delay shutdown for output 1 ... 6; I
= 300kHz 10 pF
SDO
= 25V; VCC =
OUTx
100 µA
5V
= 16V; VCC =
OUTx
100 µA
5V
= 16V; VCC =
OUTx
10 µA
1V
≤ I
; I
clp
outp
= 10mA
test
45 60 V
with correlation
= 500mA; Tj = +150°C 1.5 W
OUT
= 16V; f = 1MHz 300 pF
OUT
OUT
≤ 1/2 I
SBC
0.2 3 12 µs
4/11
Loading...