Datasheet

© 2009 Microchip Technology Inc. DS22153C-page 15
MCP9843/98243
5.0 FUNCTIONAL DESCRIPTION
The MCP9843/98243 temperature sensors consists of
a band-gap type temperature sensor, a Delta-Sigma
Analog-to-Digital Converter (ΣΔ ADC), user-program-
mable registers and a 2-wire I
2
C protocol compatible
serial interface. Figure 5-1 shows a block diagram of
the register structure.
FIGURE 5-1: Functional Block Diagram.
Clear Event
0.5°C/bit
0.25°C/bit
0.125°C/bit
0.0625°C/bit
Temperature
T
UPPER
T
LOWER
Configuration
ΣΔ ADC
Band-Gap
Temperature
Sensor
Event Status
Output Control
Critical Event only
Event Polarity
Event Comp/Int
T
CRIT
Capability
Temp. Range
Accuracy
Output Feature
Register
Pointer
Critical Trip Lock
Alarm Win. Lock Bit
Shutdown
Hysteresis
Manufacturer ID
Resolution
Memory
Control
Logic
Address
Standard
Array
Write
Write Protect
Circuitry
Sense Amp
R/W Control
Protected
(00h-7Fh)
(80h-FFh)
Device ID/Rev
Selected Resolution
HV Generator
Decoder
Array
X
Address Decoder
Y
Standard I
2
C
Interface
A0
A1
A2
Event
SDA
SCL
V
DD
GND
I
2
C Bus Time-out
Accepts V
HV
Shutdown Status
MCP9843/98243 Temperature Sensor
MCP98243 EEPROM