Datasheet

TMP421
TMP422
TMP423
SBOS398C –JULY 2007–REVISED MAY 2012 www.ti.com
ELECTRICAL CHARACTERISTICS: TMP421C
At T
A
= –40°C to +125°C and V+ = 2.55V to 5.5V, unless otherwise noted.
TMP421C
PARAMETER CONDITIONS MIN TYP MAX UNIT
TEMPERATURE ERROR
Local Temperature Sensor TE
LOCAL
T
A
= –40°C to +125°C ±1.25 ±2.5 °C
T
A
= +15°C to +85°C, V+ = 3.3V ±0.25 ±1.5 °C
Remote Temperature Sensor
(1)
TE
REMOTE
T
A
= +15°C to +85°C, T
D
= –40°C to +150°C, V+ = 3.3V ±0.25 ±1 °C
T
A
= –40°C to +100°C, T
D
= –40°C to +150°C, V+ = 3.3V ±1 ±3 °C
T
A
= –40°C to +125°C, T
D
= –40°C to +150°C ±3 ±5 °C
vs Supply (Local/Remote) V+ = 2.55V to 5.5V ±0.2 ±0.5 °C/V
TEMPERATURE MEASUREMENT
Conversion Time (per channel) 100 115 130 ms
Resolution
Local Temperature Sensor (programmable) 12 Bits
Remote Temperature Sensor 12 Bits
Remote Sensor Source Currents
High Series Resistance 3kΩ Max 120 μA
Medium High 60 μA
Medium Low 12 μA
Low 6 μA
Remote Transistor Ideality Factor η TMP421C Optimized Ideality Factor 1.008
SMBus INTERFACE
Logic Input High Voltage (SCL, SDA) V
IH
2.1 V
Logic Input Low Voltage (SCL, SDA) V
IL
0.8 V
Hysteresis 500 mV
SMBus Output Low Sink Current 6 mA
SDA Output Low Voltage V
OL
I
OUT
= 6mA 0.15 0.4 V
Logic Input Current 0 ≤ V
IN
≤ 6V –1 +1 μA
SMBus Input Capacitance (SCL, SDA) 3 pF
SMBus Clock Frequency 3.4 MHz
SMBus Timeout 25 30 35 ms
SCL Falling Edge to SDA Valid Time 1 μs
DIGITAL INPUTS
Input Capacitance 3 pF
Input Logic Levels
Input High Voltage V
IH
0.7(V+) (V+)+0.5 V
Input Low Voltage V
IL
–0.5 0.3(V+) V
Leakage Input Current I
IN
0V ≤ V
IN
≤ V+ 1 μA
POWER SUPPLY
Specified Voltage Range V+ 2.55 5.5 V
Quiescent Current I
Q
0.0625 Conversions per Second 32 38 μA
Eight Conversions per Second 400 525 μA
Serial Bus Inactive, Shutdown Mode 3 10 μA
Serial Bus Active, f
S
= 400kHz, Shutdown Mode 90 μA
Serial Bus Active, f
S
= 3.4MHz, Shutdown Mode 350 μA
Undervoltage Lockout UVLO 2.3 2.4 2.5 V
Power-On Reset Threshold POR 1.6 2.3 V
TEMPERATURE RANGE
Specified Range –40 +125 °C
Storage Range –60 +130 °C
Thermal Resistance θ
JA
DSBGA 128 °C/W
(1) Tested with less than 5Ω effective series resistance and 100pF differential input capacitance.
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