Datasheet

© 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°C Hysteresis
0x02 T
UPPER
0x0000 0°C
0x03 T
LOWER
0x0000 0°C
0x04 T
CRIT
0x0000 0°C
0x05 T
A
0x0000 0°C
0x06 Manufacturer ID 0x0054 0x0054 (hex)
0x07 Device ID/Device Revision 0x0400 0x0400 (hex)
0x08 Resolution 0x03 0x03 (hex)