Datasheet

TMP431
TMP432
www.ti.com SBOS441F –SEPTEMBER 2009–REVISED AUGUST 2013
ELECTRICAL CHARACTERISTICS
At T
A
= –40°C to +125°C and V
S
= 2.7V to 5.5V, unless otherwise noted.
TMP431
TMP432
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
= +0°C to +100°C, V
S
= 3.3V ±0.25 ±1 °C
Remote Temperature Sensor
(1)
TE
REMOTE
T
A
= 0°C to +100°C, T
DIODE
= –40°C to +150°C, V
S
= 3.3V ±0.25 ±1 °C
T
A
= –40°C to +100°C, T
DIODE
= –40°C to +150°C, V
S
= 3.3V ±0.5 ±1.5 °C
T
A
= –40°C to +125°C, T
DIODE
= –40°C to +150°C ±3 ±5 °C
vs Supply (Local/Remote) V
S
= 2.7V to 5.5V ±0.2 ±0.5 °C/V
TEMPERATURE MEASUREMENT
Conversion Time (per channel)
Local Channel 12 15 17 ms
Remote Channel
RC = 1 97 126 137 ms
MBeta Correction Enabled
(2)
RC = 0 36 47 52 ms
RC = 1 72 93 100 ms
MBeta Correction Disabled
(3)
RC = 0 33 44 47 ms
Resolution
Local Channel 12 Bits
Remote Channel 12 Bits
Remote Sensor Source Currents
High 120 μA
Series Resistance (beta correction)
(4)
Medium High 60 μA
Medium Low 12 μA
Low 6 μA
Remote Transistor Ideality Factor η TMP431/32 optimized ideality factor 1.000
(2)
1.008
(3)
Beta Correction Range β 0.1 27
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 32 35 ms
SCL Falling Edge to SDA Valid Time 1 μs
DIGITAL OUTPUTS
Output Low Voltage V
OL
I
OUT
= 6mA 0.15 0.4 V
High-Level Output Leakage Current I
OH
V
OUT
= V
S
0.1 1 μA
ALERT/THERM2 Output Low Sink Current ALERT/THERM2 Forced to 0.4V 6 mA
THERM Output Low Sink Current THERM2 Forced to 0.4V 6 mA
(1) Tested with less than 5Ω effective series resistance and 100pF differential input capacitance. T
A
is the ambient temperature of the
TMP431/32. T
DIODE
is the temperature at the remote diode sensor.
(2) Beta correction configuration set to '1000' and sensor is GND collector-connected (PNP collector to ground).
(3) Beta correction configuration set to '0111' or sensor is diode-connected (base shorted to collector).
(4) If beta correction is disabled ('0111'), then up to 1kΩ of series line resistance is cancelled; if beta correction is enabled ('1xxx'), up to
300Ω is cancelled.
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