Microchip Technology TC1321EOA Datasheet
TC1321
10-Bit Digital-to-Analog Converter with Two-Wire Interface
Features
• 10-Bit Digital-to-Analog Converter
• 2.7-5.5V Single Supply Operation
2
•SimpleSMBus/I
CTMSerial Interface
• Low Power: 350µA Operation, 0.5µA Shutdown
• 8-Pin SOIC and 8-Pin MSOP Packages
Applications
• Programmable VoltageSources
• Digital Controlled Amplifiers/Attenuators
• Process Monitoring and Control
Device Selection Table
Part
Number
TC1321EOA 8-Pin SOIC (Narrow) -40°C to +85°C
TC1321EUA 8-Pin MSOP -40°C to +85°C
Package Temperature Range
General Description
The TC1321 is a serially accessible 10-bit voltage output digital-to-analog converter (DAC). The DAC produces an output voltage that ranges from ground to an
externally supplied reference voltage. It operates from
a singlepower supply that can range from 2.7V to 5.5V,
making it ideal for a wide range of applications. Built
into the part is a Power-on Reset function that ensures
that the device starts at a known condition.
Communicationwith the TC1321 is accomplishedviaa
simple 2-wire SMBus/I
2
C compatible serial port, with
theTC1321 actingas a slave only device. The host can
enablethe SHDN bit in the CONFIG register to activate
the Low Power Standby mode.
Package Type
8-Pin MSOP and
8-Pin SOIC (Narrow)
V
1
REF
27
SDA
SCL
GND
TC1321
36
45
8
V
DD
DAC-OUT
NC
V
OUT
Typical Application
V
IN
V
DD
(8)
TC1321
V
V
REF
2002 Microchip TechnologyInc. DS21387B-page 1
(1)
Serial Port
(3)
SCLK
Microcontroller
DAC
(2)
SDAT
OUT
(5)
–
+
V
ADJUST
TC1321
Functional Block Diagram
V
DD
Configuration Register
TC1321
SDA
SCL
Serial Port
Interface
Data Register
Control
DAC
V
REF
GND
DAC-OUT
V
OUT
DS21387B-page 2
2002 Microchip TechnologyInc.
TC1321
1.0 ELECTRICAL
CHARACTERISTICS
*Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. These
are stress ratings only and functional operation of t he device
at these or any other conditions above those indicated in the
Absolute Maximum Ratings*
Supply Voltage (VDD).............................................+6V
VoltageonanyPin ...(GND–0.3V)to(V
DD
+0.3V)
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affectdevice reliability.
Current on any Pin............................................ ±50mA
Package Thermal Resistance(θ
Operating Temperature (T
StorageTemperature (T
A
STG
)............ 330°C C/W
JA
)........................ See Below
)..............-65°C to +150°C
TC1321 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: VDD= 2.7V to 5.5V, -40°C≤ TA≤ +85°C,V
Symbol Parameter Min Typ Max Unit Test Conditions
Power Supply
V
DD
I
DD
I
DD-STANDBY
SupplyVoltage 2.7 — 5.5 V
Operating Current — 350 500 mA VDD=5.5V,V
Standby SupplyCurrent — 0.1 1 µAVDD=3.3V
Static Performance - Analog Section
Resolution — — 10 Bits
INL Integral Non-Linearity at FS, T
= +25°C — — ±4.0 LSB (Note 2)
A
FSE Full Scale Error — — ±3 %FS
DNL Differential Non-Linearity, T
V
OS
TCV
OS
Offset Error at V
OUT
Offset Error Tempco at V
= +25°C -1 — +2 LSB All Codes (Note 2)
A
—±0.3 ±8 mV(Note 2)
OUT
—10 —µv/°C
PSRR Power Supply Rejection Ratio — 80 — dB V
V
I
REF
V
R
I
OUT
I
SC
REF
SW
OUT
Voltage Reference Range 0 — VDD–1.2 V
Reference Input Leakage Current — — ±1.0 µA
Voltage Swing 0 — V
Output Resistance @ V
OUT
—5.0 — Ω R
Output Current(Source or Sink) — 2 — mA
Output Short-Circuit Current
V
=5.5V
DD
—
—
Dynamic Performance
SR VoltageOutputSlewRate — 0.8 — V/µs
t
SETTLE
t
WU
Output Voltage Full Scale Settling Time — 10 — µsec
Wake-up Time — 20 — µs
Digital Feed Through and Crosstalk — 5 — nV-s SDA = V
Serial Port Interface
V
IH
V
IL
V
OL
C
IN
I
LEAK
Note 1: SDA and SCL must be connected to V
LogicInputHigh 2.4 — V
Logic Input Low — — 0.6 —
SDA OutputLow —
—
Input Capacitance SDA, SCL — 5 0.4 pF
I/O Leakage — — ±1.0 µA
or GND.
2: Measured at V
≥ 50mV referredto GND to avoid output buffer clipping.
OUT
DD
= 1.2 unless otherwisenoted.
REF
REF
30
20
—
—
50
50
DD
0.4
0.6
Serial Port Inactive (Note 1)
REF
Serial Port Inactive (Note 1)
at DC
DD
VV
≤ (VDD–1.2V)
REF
(Ω)
OUT
mAmASource
Sink
,SCL=100kHz
DD
V
VVIOL= 3mA (Sinking Curre nt)
I
=6mA
OL
=1.2V
2002 Microchip TechnologyInc. DS21387B-page 3
TC1321
TC1321 ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: VDD= 2.7V to 5.5V, -40°C≤ TA≤ +85°C,V
Symbol Parameter Min Typ Max Unit Test Conditions
Serial Port AC Timing
f
SMB
t
IDLE
t
H(START)
t
SU(START)
t
SU(STOP)
t
H-DATA
t
SU-DATA
t
LOW
t
HIGH
t
F
t
R
t
POR
Note 1: SDA and SCL must be connected to V
SMBus Clock Frequency 10 — 100 kHz
BusFreeTimePriortoNewTransition 4.7 — — µsec
START Condition Hold Time 4.0 — — µsec
START Condition Setup Time 4.7 — — µsec 90%SCLto10%SDA
STOP Condition Setup Time 4.0 — — µsec
Data In Hold Time 100 — — nsec
Data In Setup Time 100 — — nsec
Low Clock Period 4.7 — — µsec 10% to 10%
High Clock Period 4 — — µsec 90% to 90%
SMBus Fall Time — — 300 nsec 90% to 10%
SMBus Rise Time — — 1000 nsec 10%to90%
Power-on Reset Delay — 500 — µsec VDD ≥ V
or GND.
2: Measured at V
≥ 50mV referredto GND to avoid output buffer clipping.
OUT
DD
= 1.2 unless otherwisenoted.
REF
(forRepeated START
Condition)
(Rising Edge)
POR
DS21387B-page 4
2002 Microchip TechnologyInc.
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1: PIN F UNCTION TABLE
Pin Number Symbol Type Description
1V
2 SDA Bi-Directional Bi-directional. Serial data is transferred on the SMBus in both directions
3 SCL Input Input. SMBus serial clock. Clocks data into and out of the TC1321.
4 GND Power Ground.
5V
6 NC None No connection.
7 DAC-OUT Output Output. Unbuffered DAC output voltage. This voltage is a function of the
8V
REF
OUT
DD
Input Input. Voltage Reference Input can range from 0V to 1.2V below VDD.
usingthispin.
Output Output. Buffered DAC output voltage. This voltage is a function of the
reference voltageandthe contents of the DATA register.
reference voltageandthe contents of the DATA register. This outputis
unbuffered and care must be taken that the pin is connectedonlyto a
high-impedancenode.
Power Positive power supply input.See electrical specifications.
TC1321
2002 Microchip TechnologyInc. DS21387B-page 5
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