MAX6693UP9A+ Maxim Integrated Products, MAX6693UP9A+ Datasheet - Page 13

• Manufacturer Part Number: MAX6693UP9A+
• Description: IC TEMP MONITOR 7CH 20-TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX6693UP9A+

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Buffer, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: -40°C ~ 125°C, External Sensor
• Output Type: SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

tion exists, but the ALERT output reasserts at the end of
the next conversion. The bits indicating the fault for the
OVERT interrupt output clear only on reading the status 2
register even if the fault conditions still exist. Reading the
status 2 register does not clear the OVERT interrupt out-
put. To eliminate the fault condition, either the measured
temperature must drop below the temperature threshold
minus the hysteresis value (4°C), or the trip temperature
must be set at least 4°C above the current temperature.
The MAX6693 directly measures the die temperature of
CPUs and other ICs that have on-chip temperature-
sensing diodes (see the Typical Application Circuit ) or
it can measure the temperature of a discrete diode-
connected transistor.
Table 4. Configuration 1 Register
Table 5. Configuration 2 Register
7 (MSB)
7 (MSB)
BIT
BIT
6
5
4
3
2
1
0
6
5
4
3
2
1
0
Beta compensation
Mask Local ALERT
7-Channel Precision Temperature Monitor
Applications Information
Mask ALERT 6
Mask ALERT 5
Mask ALERT 4
Mask ALERT 3
Mask ALERT 2
Mask ALERT 1
cancellation
RESERVED
Resistance
______________________________________________________________________________________
TIMEOUT
Reserved
Reserved
Reserved
NAME
STOP
NAME
POR
Remote-Diode Selection
STATE
POR
STATE
POR
0
0
0
0
1
1
0
0
0
0
0
0
0
0
0
0
Standby-Mode Control Bit. If STOP is set to logic 1, the MAX6693 stops
converting and enters standby mode.
Reset Bit. Set to logic 1 to put the device into its power-on state. This bit is self-
clearing.
Timeout Enable Bit. Set to logic 0 to enable SMBus timeout.
Reserved. Must set to 0.
Resistance Cancellation Bit. When set to logic 1, the MAX6693 cancels series
resistance in the channel 1 thermal diode.
Beta Compensation Bit. When set to logic 1, the MAX6693 compensates for low
beta in the channel 1 thermal sensing transistor.
—
—
—
Local Alert Mask. Set to logic 1 to mask local channel ALERT.
Channel 6 Alert Mask. Set to logic 1 to mask channel 6 ALERT.
Channel 5 Alert Mask. Set to logic 1 to mask channel 5 ALERT.
Channel 4 Alert Mask. Set to logic 1 to mask channel 4 ALERT.
Channel 3 Alert Mask. Set to logic 1 to mask channel 3 ALERT.
Channel 2 Alert Mask. Set to logic 1 to mask channel 2 ALERT.
Channel 1 Alert Mask. Set to logic 1 to mask channel 1 ALERT.
with Beta Compensation
The accuracy of the remote temperature measure-
ments depends on the ideality factor (n) of the remote
“diode” (actually a transistor). The MAX6693 is opti-
mized for n = 1.006 (channel 1) and n = 1.008 (chan-
nels 2–6). A thermal diode on the substrate of an IC is
normally a pnp with the base and emitter brought out to
the collector (diode connection) grounded. DXP_ must
be connected to the anode (emitter) and DXN_ must be
connected to the cathode (base) of this pnp. If a sense
transistor with an ideality factor other than 1.006 or
1.008 is used, the output data is different from the data
obtained with the optimum ideality factor. Fortunately,
the difference is predictable. Assume a remote-diode
sensor designed for a nominal ideality factor n
is used to measure the temperature of a diode with a
different ideality factor n
T
M
can be corrected using:
FUNCTION
FUNCTION
Effect of Ideality Factor
1
. The measured temperature
NOMINAL
13