SA56004X Datasheet, PDF (13/23 Pages) NXP Semiconductors – 1 Degrees Celcious accurate, SMBus-compatible, 8-pin, remote/local digital temperature sensor with over temperature alarms

Philips Semiconductors
±1 °C accurate, SMBus-compatible, 8-pin, remote/local
digital temperature sensor with over temperature alarms
Product data sheet
SA56004X
Table 6. Status Register (SR) bit assignment
Read only address 02h
Bit Name/Function
POR
state
7 BUSY
n/a
When ‘1’ A/D is busy converting.
6 LHIGH
0
When ‘1’ indicates Local HIGH temperature alarm.
5 LLOW
0
When ‘1’ indicates a Local LOW temperature alarm.
4 RHIGH
0
When ‘1’ indicates a Remote Diode HIGH
temperature alarm.
3 RLOW
0
When ‘1’ indicates a Remote Diode LOW
temperature alarm.
2 OPEN
0
When ‘1’ indicates a Remote Diode disconnect.
1 RCRIT
0
When ‘1’ indicates a Remote Diode Critical
Temperature alarm.
0 LCRIT
0
When ‘1’ indicates a Local Critical Temperature
alarm.
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
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah to FFh
Conversion rate (Hz)
0.06
0.12
0.25
0.50
1.0
2
4
8
16
32
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).
2004 Oct 06
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