TMP435 datasheet(17/35 Pages) TI1

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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

The Conversion Rate Register (pointer address 0Ah)

channel, the automatic detection is bypassed and the

controls the rate at which temperature conversions

temperature

measured

assuming

are performed. This register adjusts the idle time

diode-connected sensor. A PNP transistor may

between conversions but not the conversion timing

continue to be GND collector-connected in this mode,

itself, thereby allowing the TMP435 power dissipation

but no beta compensation factor is applied. When the

to be balanced with the temperature register update

beta correction is set to '0111' or the sensor is

rate. Table 7 shows the conversion rate options and

diode-connected (base shorted to collector), the

corresponding current consumption.

n-factor used by the TMP435 is 1.008. When the beta

correction

configuration

set

'1xxx'

(beta

Beta Compensation Configuration Register

correction

enabled)

and

the

sensor

GND

collector-connected (PNP collector to ground), the

If the Beta Compensation Configuration Register is

n-factor used by the TMP435 is 1.000. Table 8 shows

set to '1xxx' (beta correction enabled) for a given

the read value for the selected beta ranges and the

channel at the beginning of each temperature

appropriate n-factor used for each conversion.

conversion, the TMP435 automatically detects if the

sensor

diode-connected

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)

CONVERSION/SEC

VS = 2.7V VS = 5.5V

0.0625

0.125

0.25

0.5

103

128

155

190

220

07h to 0Fh

373

413

Table 8. Beta Compensation Configuration Register

BCx3-BCx0

BETA RANGE DESCRIPTION

n-FACTOR

TIME

1000

Automatically selected range 0 (0.10 < beta < 0.18)

1.000

126ms

1001

Automatically selected range 1 (0.16 < beta < 0.26)

1.000

126ms

1010

Automatically selected range 2 (0.24 < beta < 0.43)

1.000

126ms

1011

Automatically selected range 3 (0.35 < beta < 0.78)

1.000

126ms

1100

Automatically selected range 4 (0.64 < beta < 1.8)

1.000

126ms

1101

Automatically selected range 5 (1.4 < beta < 9.0)

1.000

126ms

1110

Automatically selected range 6 (6.7 < beta < 40.0)

1.000

126ms

1111

Automatically selected range 7 (beta > 27.0)

1.000

126ms

1111

Automatically detected diode connected sensor

1.008

93ms

0000

Manually selected range 0 (0.10 < beta < 0.5)

1.000

93ms

0001

Manually selected range 1 (0.13 < beta < 1.0)

1.000

93ms

0010

Manually selected range 2 (0.18 < beta < 2.0)

1.000

93ms

0011

Manually selected range 3 (0.3 < beta < 25)

1.000

93ms

0100

Manually selected range 4 (0.5 < beta < 50)

1.000

93ms

0101

Manually selected range 5 (1.1 < beta < 100)

1.000

93ms

0110

Manually selected range 6 (2.4 < beta < 150)

1.000

93ms

0111

Manually disabled beta correction

1.008

93ms

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