TMP435
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SBOS495A –MARCH 2010–REVISED APRIL 2010
Conversion Rate Register
If the Beta Compensation Configuration Register is
set to '0111' (beta correction disabled) for a given
channel, the automatic detection is bypassed and the
The Conversion Rate Register (pointer address 0Ah)
controls the rate at which temperature conversions
are performed. This register adjusts the idle time
between conversions but not the conversion timing
itself, thereby allowing the TMP435 power dissipation
to be balanced with the temperature register update
rate. Table 7 shows the conversion rate options and
corresponding current consumption.
temperature
diode-connected sensor.
is
measured
assuming
a
A
PNP transistor may
continue to be GND collector-connected in this mode,
but no beta compensation factor is applied. When the
beta correction is set to '0111' or the sensor is
diode-connected (base shorted to collector), the
n-factor used by the TMP435 is 1.008. When the beta
correction configuration is set to '1xxx' (beta
correction enabled) and the sensor is GND
collector-connected (PNP collector to ground), the
n-factor used by the TMP435 is 1.000. Table 8 shows
the read value for the selected beta ranges and the
appropriate n-factor used for each conversion.
Beta Compensation Configuration Register
If the Beta Compensation Configuration Register is
set to '1xxx' (beta correction enabled) for a given
channel at the beginning of each temperature
conversion, the TMP435 automatically detects if the
sensor
is
diode-connected
or
GND
collector-connected, selects the proper beta range,
and measures the sensor temperature appropriately.
Table 7. Conversion Rate Register
CONVERSION RATE REGISTER (Read = 04h, Write = 0Ah, POR = 07h)
AVERAGE IQ (TYP)
(mA)
R7
0
R6
0
R5
0
R4
0
R3
0
R2
0
R1
0
R0
0
CONVERSION/SEC VS = 2.7V VS = 5.5V
0.0625
11
17
32
38
0
0
0
0
0
0
0
1
0.125
0
0
0
0
0
0
1
0
0.25
0.5
1
28
49
0
0
0
0
0
0
1
1
47
69
0
0
0
0
0
1
0
0
80
103
155
220
413
0
0
0
0
0
1
0
1
2
128
190
373
0
0
0
0
0
1
1
0
4
07h to 0Fh
8
Table 8. Beta Compensation Configuration Register
BCx3-BCx0
BETA RANGE DESCRIPTION
n-FACTOR
1.000
1.000
1.000
1.000
1.000
1.000
1.000
1.000
1.008
1.000
1.000
1.000
1.000
1.000
1.000
1.000
1.008
TIME
1000
1001
1010
1011
1100
1101
1110
1111
1111
0000
0001
0010
0011
0100
0101
0110
0111
Automatically selected range 0 (0.10 < beta < 0.18)
Automatically selected range 1 (0.16 < beta < 0.26)
Automatically selected range 2 (0.24 < beta < 0.43)
Automatically selected range 3 (0.35 < beta < 0.78)
Automatically selected range 4 (0.64 < beta < 1.8)
Automatically selected range 5 (1.4 < beta < 9.0)
Automatically selected range 6 (6.7 < beta < 40.0)
Automatically selected range 7 (beta > 27.0)
Automatically detected diode connected sensor
Manually selected range 0 (0.10 < beta < 0.5)
Manually selected range 1 (0.13 < beta < 1.0)
Manually selected range 2 (0.18 < beta < 2.0)
Manually selected range 3 (0.3 < beta < 25)
Manually selected range 4 (0.5 < beta < 50)
Manually selected range 5 (1.1 < beta < 100)
Manually selected range 6 (2.4 < beta < 150)
Manually disabled beta correction
126ms
126ms
126ms
126ms
126ms
126ms
126ms
126ms
93ms
93ms
93ms
93ms
93ms
93ms
93ms
93ms
93ms
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