MAX6648MUA+ Maxim Integrated Products, MAX6648MUA+ Datasheet - Page 11

• Manufacturer Part Number: MAX6648MUA+
• Description: IC SENSOR REMOTE SMBUS 8UMAX
• Manufacturer: Maxim Integrated Products

Specifications of MAX6648MUA+

• Function: Temp Monitoring System (Sensor)
• Topology: ADC, Multiplexer, Register Bank
• Sensor Type: External & Internal
• Sensing Temperature: 0°C ~ 125°C, External Sensor
• Output Type: I²C™/SMBus™
• Output Alarm: Yes
• Output Fan: Yes
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Full Temp Accuracy: +/- 3 C
• Digital Output - Bus Interface: Serial (2-Wire)
• Digital Output - Number Of Bits: 10 bit + Sign
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: 0 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Temperature Sensors with Overtemperature Alarms
Table 7. Status Register Bit Assignments (02h)
clears the memory if V
power is first applied and V
the logic blocks begin operating, although reads and
writes at V
second V
prevents the ADC from converting until there is suffi-
cient headroom (V
Power-up defaults include:
• Interrupt latch is cleared.
• ADC begins autoconverting at a 4Hz rate.
• Command byte is set to 00h to facilitate quick local
• Local (internal) T
• Local (internal) T
• Remote (external) T
• Remote (external) T
• OVERT internal limit is set to +85°C; every external
• OVERT limits are set to +85°C (MAX6692).
7 (MSB)
temperature receive byte queries.
limit is set to +110°C (MAX6648).
BIT
6
5
4
3
2
1
0
CC
CC
LHIGH
RHIGH
FAULT
NAME
RLOW
LLOW
BUSY
EOT
IOT
comparator, the ADC UVLO comparator
levels below 3V are not recommended. A
Precision SMBus-Compatible Remote/Local
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
CC
HIGH
LOW
STATE
= 2.8V typ).
HIGH
LOW
POR
CC
0
0
0
0
0
0
0
0
limit set to 0°C.
limit set to +85°C.
falls below 2.0V (typ). When
limit set to 0°C.
limit set to +85°C.
CC
Power-Up Defaults
A/D is busy converting when 1.
Local (internal) high-temperature alarm has tripped when 1; cleared by POR or readout of the
status byte if the fault condition no longer exists.
Local (internal) low-temperature alarm has tripped when 1; cleared by POR or readout of the
status byte if the fault condition no longer exists.
Remote (external) high-temperature alarm has tripped when 1; cleared by POR or readout of the
status byte if the fault condition no longer exists.
Remote (external) low-temperature alarm has tripped when 1; cleared by POR or readout of the
status byte if the fault condition no longer exists.
A 1 indicates DXN and DXP are either shorted or open; cleared by POR or readout of the status
byte if the fault condition no longer exists.
A 1 indicates the remote (external) junction temperature exceeds the external OVERT threshold.
A 1 indicates the local (internal) junction temperature exceeds the internal OVERT threshold.
rises above 2.0V (typ),
The MAX6648/MAX6692 can directly measure the die
temperature of CPUs and other ICs that have on-board
temperature-sensing diodes (see Typical Operating
Circuit ), or they can measure the temperature of a dis-
crete diode-connected transistor.
The accuracy of the remote temperature measurements
depends on the ideality factor (n) of the remote “diode”
Table 8. Conversion-Rate Control Byte
(04h)
08h-FFh
DATA
00h
01h
02h
03h
04h
05h
06h
07h
FUNCTION
Applications Information
Remote-Diode Selection
Effect of Ideality Factor
CONVERSION
RATE (Hz)
Reserved
0.0625
0.125
0.25
0.5
1
2
4
4
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