?2011 Microchip Technology Inc.
DS25095A-page 33
MCP9808
5.3
Summary of Power-on Default
The MCP9808 has an internal Power-on Reset (POR)
circuit. If the power supply voltage, V
DD
, glitches below
the V
POR
 threshold, the device resets the registers to
the power-on default settings.
Table 5-3 shows the power-on default summary for the
Temperature Sensor registers.
TABLE 5-3:
POWER-ON RESET DEFAULTS
Registers
Default Register
Data (Hexadecimal)
Power-Up Default
Register Description
Address
(Hexadecimal)
Register Name
0x01
CONFIG
0x0000
Comparator Mode
Active-Low Output
Alert and Critical Output
Output Disabled
Alert Not Asserted
Interrupt Cleared
Alert Limits Unlocked
Critical Limit Unlocked
Continuous Conversion
0癈 Hysteresis
0x02
T
UPPER
0x0000
0癈
0x03
T
LOWER
0x0000
0癈
0x04
T
CRIT
0x0000
0癈
0x05
T
A
0x0000
0癈
0x06
Manufacturer ID
0x0054
0x0054 (hex)
0x07
Device ID/Device Revision
0x0400
0x0400 (hex)
0x08
Resolution
0x03
0x03 (hex)
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