Datasheet

ELECTRICAL CHARACTERISTICS
TMP441
TMP442
www.ti.com .............................................................................................................................................. SBOS425A – DECEMBER 2008 – REVISED MARCH 2009
At T
A
= – 40 ° C to +125 ° C and V
S
= 2.7V to 5.5V, unless otherwise noted.
TMP441, TMP442
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
MBeta Correction Enabled
(2)
RC = 1 97 126 137 ms
RC = 0 36 47 52 ms
MBeta Correction Disabled
(3)
RC = 1 72 93 100 ms
RC = 0 33 44 47 ms
Resolution
Local Temperature Sensor 12 Bits
Remote Temperature Sensor 12 Bits
Remote Sensor Source Currents
High Series resistance (beta correction)
(4)
120 µ A
Medium High 60 µ A
Medium Low 12 µ A
Low 6 µ A
Remote Transistor Ideality Factor η TMP441/TMP442 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 µ A
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 µ s
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
S
1 µ A
(1) Tested with less than 5 Ω effective series resistance, 100pF differential input capacitance, and an ideal diode with η -factor = 1.008. T
A
is
the ambient temperature of the TMP441/42. 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 1k Ω of series line resistance is cancelled; if beta correction is enabled ( ' 1xxx ' ), up to
300 Ω is cancelled.
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