MCP98243 datasheet(43/62 Pages) MICROCHIP

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DS22153C-page 43

MCP9843/98243

5.4

Summary of Power-on Default

The MCP9843/98243 has an internal Power-on Reset

(POR) circuit. If the power supply voltage VDD glitches

down to the VPOR_TS and VPOR_EE thresholds, the

device resets the registers to the power-on default

settings.

Table 5-6 shows the power-on default summary for the

temperature sensor. The EEPROM resets the address

pointer to 0x00 hex.

TABLE 5-6:

MCP9843/98243 TEMPERATURE SENSOR POWER-ON RESET DEFAULTS

Registers

Default Register

Data (Hexadecimal)

Power-up Default

Address

(Hexadecimal)

0x00

Capability

0x00EF

Event output de-asserts in shutdown

I2C time out 25 ms to 35 ms.

Accepts VHV at A0 Pin

0.25°C Measurement Resolution

Measures temperature below 0°C

±1°C accuracy over active range

Temperature event output

0x01

CONFIG

0x0000

Comparator mode

Active-Low output

Event and critical output

Output disabled

Event not asserted

Interrupt cleared

Event limits unlocked

Critical limit unlocked

Continuous conversion

0°C Hysteresis

0x02

TUPPER

0x0000

0°C

0x03

TLOWER

0x0000

0°C

0x04

TCRIT

0x0000

0°C

0x05

0x0000

0°C

0x06

Manufacturer ID

0x0054

0x0054 (hex)

0x07

Device ID/ Device Revision for

MCP98243

0x2101

0x2101 (hex)

0x07

Device ID/ Device Revision for

MCP9843

0x0001

0x0001 (hex)

0x08

Resolution

0x01

0x01 (hex)

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