MCP98243 datasheet(16/62 Pages) MICROCHIP

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MCP9843/98243

DS22153C-page 16

5.1

Registers

The MCP9843/98243 device has several registers that

are user-accessible. These registers include the

Capability register, Configuration register, Event

Temperature Upper-Boundary and Lower-Boundary

Trip registers, Critical Temperature Trip register,

Temperature

Manufacturer

Identification

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

MCP9843/98243 device 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

MCP9843/98243’s

capability

measurement resolution, measurement range and

device accuracy. The device Configuration register

provides access to configure the MCP9843/98243’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 MCP9843/98243 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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