Rainbow Electronics MAX1619 - Manual (Page 13)

MAX1619
Remote/Local Temperature Sensor with Dual-
Alarm Outputs and SMBus Serial Interface
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Table 4. Command-Byte Bit Assignments
* If the device is in hardware standby mode at POR, both temperature registers read 0°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 5µA when set low.
ID2 2 1 Reduces the diode current by 2.5µA when set low.
RFU 1–0 0 Reserved for future use.