+145癈 Precision SMBus-Compatible Remote/
Local Sensors with Overtemperature Alarms
10
Conversion Rate Byte
The conversion rate register (Table 8) programs the time
interval between conversions in free-running autonomous
mode (RUN = 0). This variable rate control can be used
to reduce the supply current in portable-equipment appli-
cations. The conversion rate bytes POR state is 07h or
4Hz. The MAX6646/MAX6647/MAX6649 look only at the 3
LSBs of this register, so the upper 5 bits are dont care
bits, which should be set to zero. The conversion rate tol-
erance is ?5% at any rate setting.
Valid A/D conversion results for both channels are avail-
able two total conversion times (250ms nominal, 312ms
maximum) after initiating a conversion, whether conver-
sion is initiated through the RUN bit, one-shot com-
mand, or initial power-up. Changing the conversion rate
can also affect the delay until new results are available.
REGISTER
ADDRESS
POR STATE
FUNCTION
RLTS
00h
0000 0000
0癈
Read local (internal) temperature
RRTE
01h
0000 0000
0癈
Read remote (external) temperature
RSL
02h
N/A
Read status byte
RCL
03h
0000 0000
Read configuration byte
RCRA
04h
0000 0111
Read conversion rate byte
RLHN
05h
0101 0101
+85癈
Read local (internal) ALERT high limit
RLLI
06h
0000 0000
0癈
Read local (internal) ALERT low limit
0101 1111
+95癈
Read remote (external) ALERT high limit (MAX6646/MAX6647)
RRHI
07h
0101 0101
+85癈
Read remote (external) ALERT high limit (MAX6649)
RRLS
08h
0000 0000
0癈
Read remote (external) ALERT low limit
WCA
09h
N/A
Write configuration byte
WCRW
0Ah
N/A
Write conversion rate byte
WLHO
0Bh
N/A
Write local (internal) ALERT high limit
WLLM
0Ch
N/A
Write local (internal) ALERT low limit
WRHA
0Dh
N/A
Write remote (external) ALERT high limit
WRLN
0Eh
N/A
Write remote (external) ALERT low limit
OSHT
0Fh
N/A
One-shot
REET
10h
0000 0000
0癈
Read remote (external) extended temperature
RIET
11h
0000 0000
0癈
Read local (internal) extended temperature
0111 1101
+125癈
Read/write remote (external) OVERT limit (MAX6646/MAX6647)
RWOE
19h
0101 0101
+85癈
Read/write remote (external) OVERT limit (MAX6649)
RWOI
20h
0101 0101
+85癈
Read/write local (internal) OVERT limit
HYS
21h
0000 1010
10癈
Overtemperature hysteresis
QUEUE
22h
1000 0110
Fault queue
FEh
0100 1101
Read manufacture ID
FFh
0101 1001
Read revision ID
Table 5. Command-Byte Bit Assignments
BIT
NAME
POR STATE
FUNCTION
7 (MSB)
MASK
0
Masks ALERT interrupts when set to 1.
6
RUN
0
Standby mode control bit; if set to 1, standby mode is initiated.
5 to 0
RFU
0
Reserved.
Table 6. Configuration-Byte Bit Assignments (03h)
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