Datasheet

TMP431
TMP432
SBOS441F –SEPTEMBER 2009–REVISED AUGUST 2013 www.ti.com
Consecutive Alert Register Identification Registers
The value in the Consecutive Alert Register (address The TMP431/32 allow for the Two-Wire bus controller
22h) determines how many consecutive out-of-limit to query the device for manufacturer and device IDs
measurements must occur on a measurement to enable the device for software identification of the
channel before the ALERT or the THERM signal is device at the particular Two-Wire bus address. The
activated. The value in this register does not affect manufacturer ID is obtained by reading from pointer
bits in the Status Register. Values of one, two, three, address FEh. The TMP431/32 both return 55h for the
or four consecutive conversions can be selected; one manufacturer code. The device ID is obtained by
conversion is the default. This function allows reading from pointer address FDh. The TMP431
additional filtering for the ALERT or the THERM pin. returns 31h for the device ID and the TMP432 returns
Table 14 shows the consecutive alert bits. For bit 32h for the device ID (see Table 3 and Table 4).
descriptions, refer to Table 12. These registers are read-only.
Table 12. Consecutive Alert Register Bit Table 13. Allowable THERM Hysteresis Values
Descriptions
THERM HYSTERESIS VALUE
BIT NAME NUMBER OF
TH[7:0]
CONSECUTIVE
TEMPERATURE (STANDARD
OUT-OF-LIMIT
(°C) BINARY) (HEX)
MEASUREMENTS
0 0000 0000 00
CALT2/CTH2 CALT1/CTH1 CALT0/CTH0 (ALERT/THERM)
1 0000 0001 01
0 0 0 1
5 0000 0101 05
0 0 1 2
10 0000 1010 0A
0 1 1 3
25 0001 1001 19
1 1 1 4
50 0011 0010 32
.
75 0100 1011 4B
100 0110 0100 64
Therm Hysteresis Register
125 0111 1101 7D
The THERM Hysteresis Register, shown in Table 15,
127 0111 1111 7F
stores the hysteresis value used for the THERM pin
150 1001 0110 96
alarm function. This register must be programmed
175 1010 1111 AF
with a value that is less than the Local Temperature
High Limit Register value, Remote Temperature High
200 1100 1000 C8
Limit Register value, Local THERM Limit Register
225 1110 0001 E1
value, or Remote THERM Limit Register value;
255 1111 1111 FF
otherwise, the respective temperature comparator
does not trip on the measured temperature falling
edges. Allowable hysteresis values are shown in
Table 13. The default hysteresis value is 10°C,
whether the device is operating in the standard or
extended mode setting.
Table 14. Consecutive Alert Register Format
CONSECUTIVE ALERT REGISTER
(READ = 22h, WRITE = 22h, POR = 70h)
BIT # D7 D6 D5 D4 D3 D2 D1 D0
BIT NAME 0 CTH2 CTH1 CTH0 CALT2 CALT1 CALT0 0
POR VALUE 0 1 1 1 0 0 0 0
Table 15. THERM Hysteresis Register Format
THERM HYSTERESIS REGISTER
(Read = 21h, Write = 21h, POR = 0Ah)
BIT # D7 D6 D5 D4 D3 D2 D1 D0
BIT NAME TH7 TH6 TH5 TH4 TH3 TH2 TH1 TH0
POR VALUE 0 0 0 0 1 0 1 0
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