MCP98244 datasheet(12/52 Pages) MICROCHIP

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MCP98244

DS22327C-page 12

 2012-2013 Microchip Technology Inc.

5.1

Registers

The MCP98244 device 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

MCP98244 device outputs a signal using the Event pin

(refer

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 MCP98244’s capability in measurement

resolution, measurement range and device accuracy.

The device Configuration register provides access to

configure the MCP98244’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 MCP98244 using the serial interface.

This is an 8-bit write-only pointer, and Register 5-1

describes the pointer assignment.

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

TSE2004av Device ID and Vendor Silicon Revision Register

1001

Resolution register

1XXX

Unused (The device will not acknowledge commands to other pointer locations.).

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