Data Sheet

CONFIGURATION REGISTER ALERT (AL Bit)
CONVERSION RATE
EXTENDED MODE (EM)
TMP102
www.ti.com ............................................................................................................................................... SBOS397B – AUGUST 2007 – REVISED OCTOBER 2008
Table 6. 13-Bit Temperature Data Format
TEMPERATURE ( ° C) DIGITAL OUTPUT (BINARY) HEX
150 0 1001 0110 0000 0960
128 0 1000 0000 0000 0800
127.9375 0 0111 1111 1111 07FF
100 0 0110 0100 0000 0640
80 0 0101 0000 0000 0500
75 0 0100 1011 0000 04B0
50 0 0011 0010 0000 0320
25 0 0001 1001 0000 0190
0.25 0 0000 0000 0100 0004
0 0 0000 0000 0000 0000
– 0.25 1 1111 1111 1100 1FFC
– 25 1 1110 0111 0000 1E70
– 55 1 1100 1001 0000 1C90
The Configuration Register is a 16-bit read/write The AL bit is a read-only function. Reading the AL bit
register used to store bits that control the operational will provide information about the comparator mode
modes of the temperature sensor. Read/write status. The state of the POL bit inverts the polarity of
operations are performed MSB first. The format and data returned from the AL bit. For POL = 0, the AL bit
power-up/reset value of the Configuration Register is will read as '1' until the temperature equals or
shown in Table 7 . For compatibility, the first byte exceeds T
HIGH
for the programmed number of
corresponds to the Configuration Register in the consecutive faults, causing the AL bit to read as '0'.
TMP75 and TMP275 . All registers are updated byte The AL bit will continue to read as '0' until the
by byte. temperature falls below T
LOW
for the programmed
number of consecutive faults, when it will again read
Table 7. Configuration and Power-Up/Reset as '1'. The status of the TM bit does not affect the
Format
status of the AL bit.
BYTE D7 D6 D5 D4 D3 D2 D1 D0
OS R1 R0 F1 F0 POL TM SD
1
The conversion rate bits, CR1 and CR0, configure the
0 1 1 0 0 0 0 0
TMP102 for conversion rates of 8Hz, 4Hz, 1Hz, or
CR1 CR0 AL EM 0 0 0 0
2
0.25Hz. The default rate is 4Hz. The TMP102 has a
1 0 1 0 0 0 0 0
typical conversion time of 26ms. To achieve different
conversion rates, the TMP102 makes a conversion
and after that powers down and waits for the
appropriate delay set by CR1 and CR0. Table 8
The Extended mode bit configures the device for
shows the settings for CR1 and CR0.
Normal mode operation (EM = 0) or Extended mode
operation (EM = 1). In Normal mode, the
Table 8. Conversion Rate Settings
Temperature Register and high- and low-limit
CR1 CR0 CONVERSION RATE
registers use a 12-bit data format. Normal mode is
used to make the TMP102 compatible with the
0 0 0.25Hz
TMP75 .
0 1 1Hz
Extended mode (EM = 1) allows measurement of
1 0 4Hz (default)
temperatures above +128 ° C by configuring the
1 1 8Hz
Temperature Register, and high- and low-limit
registers, for 13-bit data format.
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