MCP9803-MSLASHMSG datasheet(14/30 Pages) MICROCHIP

14 / 30 page

MCP9800/1/2/3

DS21909C-page 14

 2010 Microchip Technology Inc.

5.3

Registers

The MCP9800/1/2/3 has four registers that are

user-accessible. These registers are specified as the

Ambient Temperature (TA) register, the Temperature

Limit-set (TSET) register, the Temperature Hysteresis

(THYST) register and device Configuration (CONFIG)

The Ambient Temperature register is a read-only

data. The data from the ADC is loaded in parallel in the

Hysteresis registers are read/write registers that

provide user-programmable temperature limits. If the

ambient temperature drifts beyond the programmed

limits, the MCP9800/1/2/3 outputs an alert signal using

the ALERT pin (refer to Section 5.3.4.3 “ALERT

Output Configuration”

). The device Configuration

MCP9800/1/2/3’s various features. These registers are

described in further detail in the following sections.

The registers are accessed by sending Register Point-

ers to the MCP9800/1/2/3 using the serial interface.

This is an 8-bit pointer. However, the two Least

Significant bits (LSbs) are used as pointers and all

other bits need to be cleared <0>. This device has addi-

tional registers that are reserved for test and

calibration. If these registers are accessed, the device

may not perform according to the specification. The

pointer description is shown below.

FIGURE 5-2:

ALERT Output

Control Logic

ALERT

Output

Resolution

Temperature

THYST

TSET

Configuration

One-Shot

Shutdown

Fault Queue

Alert Polarity

Alert Comp/Int

U-0

R/W-0

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 7-2

Unimplemented:

Read as ‘0’

bit 1-0

Px<1:0>:

Pointer bits

= Temperature register (TA)

= Configuration register (CONFIG)

= Temperature Hysteresis register (THYST)

= Temperature Limit-set register (TSET)

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