MAX6636UP9A+ Maxim Integrated Products, MAX6636UP9A+ Datasheet - Page 7

• Manufacturer Part Number: MAX6636UP9A+
• Description: IC PREC TEMP MONITOR 7CH 20TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of MAX6636UP9A+

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Buffer, 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 ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP
• Full Temp Accuracy: - 0.1 C, 3 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 11 bit
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ed, and the temperature registers are not updated. The
previous data is not changed and remains available.
From a software perspective, the MAX6636 appears as
a series of 8-bit registers that contain temperature mea-
surement data, alarm threshold values, and control bits.
A standard SMBus-compatible, 2-wire serial interface is
used to read temperature data and write control bits
and alarm threshold data. The same SMBus slave
address also provides access to all functions.
The MAX6636 employs four standard SMBus protocols:
write byte, read byte, send byte, and receive byte
(Figure 2). The shorter receive byte protocol allows
Figure 1. Internal Block Diagram
7-Channel Precision Temperature Monitor
DXP1
DXN1
DXP2
DXN2
DXP3
DXN3
DXP4
DXN4
DXP5
DXN5
DXP6
DXN6
_______________________________________________________________________________________
SMBus Digital Interface
10/100μA
BUFFER
INPUT
V
CC
REF
SCL
INTERFACE
quicker transfers, provided that the correct data regis-
ter was previously selected by a read byte instruction.
Use caution with the shorter protocols in multimaster
systems, since a second master could overwrite the
command byte without informing the first master. Figure
3 is the SMBus write-timing diagram and Figure 4 is the
SMBus read-timing diagram.
The remote diode 1 measurement channel provides 11
bits of data (1 LSB = 0.125°C). All other temperature-
measurement channels provide 8 bits of temperature
data (1 LSB = 1°C). The 8 most significant bits (MSBs)
can be read from the local temperature and remote
temperature registers. The remaining 3 bits for remote
diode 1 can be read from the extended temperature
SMBus
ADC
COUNT
COUNTER
SDA
ALERT RESPONSE ADDRESS
REMOTE TEMPERATURES
LOCAL TEMPERATURES
OVERT THRESHOLD
ALERT THRESHOLD
COMMAND BYTE
MAX6636
REGISTER BANK
ALARM
ALU
OVERT
AVERT
STBY
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