SA56004GD datasheet(8/36 Pages) NXP

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SA56004X_5

Product data sheet

Rev. 05 — 22 May 2008

8 of 36

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 7 shows how the bits in this register are used.

Table 5.

Temperature data format

Temperature

Digital output

Binary

Hex

+125

°C

0111 1101 0000 0000

7D00h

+25

°C

0001 1001 0000 0000

1900h

°C

0000 0001 0000 0000

0100h

+0.125

°C

0000 0000 0010 0000

0020h

°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 6.

LTHB, LTLB, RTHB, RTLB - Local and remote temperature registers

Byte

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

Low byte (read only; address 10h)

Bit

Value

sign

8421

0.5

0.25

0.125

00000

Table 7.

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

bit assignments

Bit

Description

POR state

ALERT mask.

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

is disabled (masked) when this bit is HIGH.

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.

Not deﬁned; defaults to logic 0.

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.

Not deﬁned; defaults to logic 0.

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