Philips Semiconductors

Product data sheet

SA56004X

±1 °C accurate, SMBus-compatible, 8-pin, remote/local

digital temperature sensor with over temperature alarms

2004 Oct 06

13

Table 6. Status Register (SR) bit assignment

Read only address 02h

Bit

Name/Function

POR

state

7

BUSY

When ‘1’ A/D is busy converting.

n/a

6

LHIGH

When ‘1’ indicates Local HIGH temperature alarm.

0

5

LLOW

When ‘1’ indicates a Local LOW temperature alarm.

0

4

RHIGH

When ‘1’ indicates a Remote Diode HIGH

temperature alarm.

0

3

RLOW

When ‘1’ indicates a Remote Diode LOW

temperature alarm.

0

2

OPEN

When ‘1’ indicates a Remote Diode disconnect.

0

1

RCRIT

When ‘1’ indicates a Remote Diode Critical

Temperature alarm.

0

0

LCRIT

When ‘1’ indicates a Local Critical Temperature

alarm.

0

Conversion rate register

The conversion rate register is used to store programmable

conversion data, which defines the time interval between

conversions in the standard free-running auto convert mode. Table 7

shows all applicable data values and rates for the SA56004X. Only

the 4 LSBs of the register are used and the other bits are reserved

for future use. The register is R/W using the read address 04h and

write address 0Ah. The POR default conversion data is 08h.

Table 7. Conversion rate control byte (CR)

Data value

Conversion rate (Hz)

00h

0.06

01h

0.12

02h

0.25

03h

0.50

04h

1.0

05h

2

06h

4

07h

8

08h

16

09h

32

0Ah to FFh

n/a

Temperature limit registers

Table 8. Local and Remote HIGH Setpoint registers

(LHS, RHSHB, and RHSLB)

High Byte (Read only address 05h, 07h / Write address 0Bh, 0Dh)

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Value

Sign

64

32

16

8

4

2

1

POR default = LHS = RHSHV = 46h (70

°C).

Low Byte (Read/Write address 13h)

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Value

0.5

0.25

0.125

0

0

0

0

0

POR default RHSLB = 00h.

Table 9. Local and Remote LOW Setpoint registers

(LLS, RLSHB, and RLSLB)

High Byte (Read address 06h, 08h / Write address 0Ch, 0Eh)

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Value

Sign

64

32

16

8

4

2

1

POR default LLS = RLSHB = 00h.

Low Byte (Read/Write address 14h)

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Value

0.5

0.25

0.125

0

0

0

0

0

POR default RLSLB = 00h (0

°C).

Table 10. Local and Remote T_CRIT registers

(LCS and RCS)

Single High Byte (Read/Write address 20h, 19h)

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Value

Sign

64

32

16

8

4

2

1

POR default LCS = RCS = 55h (85

°C).

Table 11. T_CRIT Hysteresis register (TH)

Single High Byte (Read and Write address 21h)

Bit

D7

D6

D5

D4

D3

D2

D1

D0

Value

–

–

–

16

8

4

2

1

POR default TH = 0Ah (10

°C).