Datasheet

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Product data sheet Rev. 7 — 25 February 2013 10 of 43

NXP Semiconductors

SA56004X

Digital temperature sensor with overtemperature alarms

7.8 SA56004X SMBus registers

7.8.1 Command register

The command register selects which register will be read or written to. Data for this

communication.

7.8.2 Local and remote temperature registers (LTHB, LTLB, RTHB, RTLB)

7.8.3 Configuration register (CON)

The configuration register is an 8-bit register with read address 03h and write address

09h. Table 8

shows how the bits in this register are used.

Table 6. Temperature data format

Temperature Digital output

Binary Hexadecimal

+125 C 0111 1101 0000 0000 7D00h

+25 C 0001 1001 0000 0000 1900h

+1 C 0000 0001 0000 0000 0100h

+0.125 C 0000 0000 0010 0000 0020h

0 C 0000 0000 0000 0000 0000h

0.125 C 1111 1111 1110 0000 FFE0h

1 C 1111 1111 0000 0000 FF00h

25 C 1110 0111 0000 0000 E700h

55 C 1100 1001 0000 0000 C900h

Table 7. LTHB, LTLB, RTHB, RTLB - Local and remote temperature registers

Byte High byte (read only; address 00h, 01h) Low byte (read only; address 10h)

Bit D7 D6 D5 D4 D3 D2 D1 D0 D7 D6 D5 D4 D3 D2 D1 D0

Valuesign64321684210.50.250.12500000

Table 8. CON - Configuration register (read address 03h; write address 09h)

bit assignments

Bit Description POR state

7ALERT

mask.

The ALERT interrupt is enabled when this bit is LOW. The ALERT interrupt

is disabled (masked) when this bit is HIGH.

6 RUN

/STOP.

Standby or run mode control. Running mode is enabled when this bit is

LOW. The SA56004X is in standby mode when this bit is HIGH.

5 Not defined; defaults to logic 0. 0

4 Remote T_CRIT

mask.

The T_CRIT

output will be activated by a remote temperature that exceeds

the remote T_CRIT setpoint when this bit is LOW. The T_CRIT output

will not be activated under this condition when this bit is HIGH.

3 Not defined; defaults to logic 0. 0