MCP98243 datasheet(16/62 Pages) MICROCHIP

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MCP98243

DS22153B-page 16

5.1

Registers

The MCP98243 has several registers that are

user-accessible. These registers include the Capability

Upper-Boundary and Lower-Boundary Trip registers,

Critical

Temperature

Trip

Temperature

Device Identification register.

The Temperature register is read-only, used to access

the ambient temperature data. The data is loaded in

parallel to this register after tCONV. The Event

Temperature Upper-Boundary and Lower-Boundary

Trip registers are read/writes. If the ambient

temperature drifts beyond the user-specified limits, the

MCP98243 outputs a signal using the Event pin (refer

to Section 5.2.3 “Event Output Configuration”). In

addition, the Critical Temperature Trip register is used

to provide an additional critical temperature limit.

The Capability register is used to provide bits

describing the MCP98243’s capability in measurement

resolution, measurement range and device accuracy.

The device Configuration register provides access to

configure the MCP98243’s various features. These

registers are described in further detail in the following

sections.

The registers are accessed by sending a Register

Pointer to the MCP98243 using the serial interface.

This is an 8-bit write-only pointer. However, the four

Least Significant bits are used as pointers and all

unused bits (bits 7-4) need to be cleared or set to ‘0’.

each register.

W-0

—

Pointer Bits

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 7-4

Writable Bits: Write ‘0’’

bit 3-0

Pointer Bits:

0000

Capability register

0001

Configuration register (CONFIG)

0010

Event Temperature Upper-Boundary Trip register (TUPPER)

0011

Event Temperature Lower-Boundary Trip register (TLOWER)

0100

Critical Temperature Trip register (TCRIT)

0101

Temperature register (TA)

0110

Manufacturer ID register

0111

Device ID/Revision register

1000

Resolution register

1XXX

Reserved (This device has additional registers that are reserved for test and calibration. If

these registers are accessed, the device may not perform according to the specification.)

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