Datasheet

MAX6694
5-Channel Precision Temperature Monitor
with Beta Compensation
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Detailed Description
The MAX6694 is a precision multichannel temperature
monitor that features one local and four remote temper-
ature-sensing channels with a programmable alert
threshold for each temperature channel and a program-
mable overtemperature threshold for channels 1 and 4
(see Figure 1). Communication with the MAX6694 is
achieved through the SMBus serial interface and a
dedicated alert output. The alarm outputs, OVERT and
ALERT, assert if the software-programmed temperature
thresholds are exceeded. ALERT typically serves as an
interrupt, while OVERT can be connected to a fan, sys-
tem shutdown, or other thermal-management circuitry.
ADC Conversion Sequence
In the default conversion mode, the MAX6694 starts the
conversion sequence by measuring the temperature on
channel 1, followed by 2, 3, local channel, and 4. The
conversion result for each active channel is stored in
the corresponding temperature data register.
Low-Power Standby Mode
Enter software standby mode by setting the STOP bit to
1 in the configuration 1 register. Enter hardware stand-
by by pulling STBY low. Software standby mode dis-
ables the ADC and reduces the supply current to
approximately 3µA. Hardware standby mode halts the
ADC clock, but the supply current is approximately
Figure 1. Internal Block Diagram
DXP2
DXN2
DXP3
DXN3
DXP4
DXN4
V
CC
REF
COMMAND BYTE
REMOTE TEMPERATURES
LOCAL TEMPERATURES
REGISTER BANK
ALERT THRESHOLD
OVERT THRESHOLD
ALERT RESPONSE ADDRESS
ALARM
ALU
SMBus
INTERFACE
MAX6694
SMBCLK SMBDATA
OVERT
ALERT
STBY
DXP1
DXN1
CURRENT
SOURCES,
BETA
COMPEN-
SATION
AND MUX
ADC
INPUT
BUFFER