Remote/Local Temperature Sensor with Dual-
Alarm Outputs and SMBus Serial Interface
______________________________________________________________________________________ 13
Table 4. Command-Byte Bit Assignments
*If the device is in hardware standby mode at POR, both temperature registers read 0?/SPAN>C.
Read remote temperature: returns latest temperature
RRTE
01h
00h
COMMAND
0000 0000*
0000 0000*
POR STATE
Read configuration byte
RCL
03h
02h
0000 1100
N/A
Read status byte (flags, busy signal)
RSL
Read remote T
MAX
limit
RRTM
10h
Read local temperature: returns latest temperature
RLTS
04h
01100100
0000 0010
Read remote T
HIGH
limit
RRHI
07h
11h
0111 1111
01011111
Read remote T
HYST
limit
RRTH
Read conversion rate byte
REGISTER
RCRA
Write configuration byte
WCA
09h
08h
N/A
1100 1001
FUNCTION
Write remote T
MAX
limit
WRTM
12h
0Ah
N/A
N/A
Write conversion rate byte
WCRW
Write remote T
HIGH
limit
WRHA
0Dh
Read remote T
LOW
limit
RRLS
13h
N/A
N/A
One-shot command
OSHT
0Fh
0Eh
N/A
N/A
Write remote T
LOW
limit
WRLN
Write remote T
HYST
limit
WRTH
RUN/
STOP
6
0
0
POR STATE
Standby mode control bit. If high, the device immediately stops converting and
enters standby mode. If low, the device converts in either one-shot or timer
mode.
Masks all ALERT interrupts when high.
FUNCTION
POL
5
0
Determines the polarity of the OVERT output:
0 = active low (low when overtemp)
1 = active high
MASK
7 (MSB)
BIT
NAME
Table 5. Configuration-Byte Bit Assignments
Write address
WADD
FDh
FCh
N/A
N/A
Read device ID code
DEV ID
FFh
FEh
0000 0100
0100 1101
Read manufacturer ID code
MFG ID
Write software POR
SPOR
PROT
4
0
When asserted high, locks out all subsequent writes to:
[] Configuration register bits 6, 5, 4, 3, 2 (RUN/STOP, POL, PROT, ID1, ID2)
[] T
MAX
register
[] T
HYST
register
[] Conversion rate register
[] Diode Current
ID1
3
1
Reduces the diode current by 5礎 when set low.
ID2
2
1
Reduces the diode current by 2.5礎 when set low.
RFU
10
0
Reserved for future use.
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