allowing greater flexibility in routing thermal diodes.
Beta Compensation eliminates temperature errors
caused by low, variable beta transistors common in
today's fine geometry processors. The automatic beta
detection feature monitors the external diode/transistor
and determines the optimum sensor settings for
accurate temperature measurements regardless of
processor technology. This frees the user from
providing unique sensor configurations for each
temperature monitoring application. These advanced
features plus ±1°C measurement accuracy for both
external and internal diode temperatures provide a
low-cost, highly flexible and accurate solution for
critical temperature monitoring applications.
Typical Applications
•
•
•
•
•
General Purpose Temperature Sensing
Industrial Freezers and Refrigerators
Food Processing
Base Stations
Remote Radio Unit
Package Types
MCP9902
2 x 2 WDFN*
V
DD
1
DP1 2
DN1 3
THERM/ADDR 4
EP
9
8 SMCLK
7 SMDATA
6 ALERT/THERM2
5 GND
V
DD
1
DP1 2
DN1 3
DP2 4
DN2 5
10 SMCLK
EP
11
9
8
7
6
SMDATA
ALERT/THERM2
THERM/ADDR
GND
EP
11
MCP9903
3 x 3 VDFN*
10 SMCLK
9
8
7
6
SMDATA
ALERT/THERM2
THERM/ADDR
GND
MCP9904
3 x 3 VDFN*
V
DD
1
DP1 2
DN1 3
DP2/DN3 4
DN2/DP3 5
* Includes Exposed Thermal Pad (EP); see
Table 3-1.
2015-2016 Microchip Technology Inc.
DS20005382C-page 1
MCP9902/3/4 Functional Block Diagram
V
DD
MCP990X
Conversion Rate Register
Digital Mux
Limit Comparator
Digital Mux
Internal
Temp Diode
Internal
Temperature Register
ALERT
Interupt Masking
Configuration Register
THERM/ADDR
Status Registers
GND
SMBus Address Decode
Note 1:
Second remote channel for
MCP9903
and
MCP9904.
2:
Third remote channel for
MCP9904.
SMBus Interface
DS20005382C-page 2
Low Limit Registers
SMCLK
High Limit Registers
THERM Limit Register
External Temperature
Register(s)
SMDATA
Analog
Mux
'6
ADC
THERM Hysteresis Register
Switching
Current
DP1
MCP9902/3/4
DN1
DP2
(1)
/DN3
(2)
DN2
(1)
/DP3
(2)
2015-2016 Microchip Technology Inc.
MCP9902/3/4
1.0
1.1
ELECTRICAL CHARACTERISTICS
Electrical Specifications
Absolute Maximum Ratings
(†)
Ambient Temperature under Bias...................................................................................................... -40°C to +125°C
Storage Temperature ....................................................................................................................... -65°C to +150°C
Voltage on V
DD
with respect to V
SS
................................................................................................... -0.3V to +4.0V
Voltage on all other pins with respect to V
SS
........................................................................... -0.3V to (V
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