TCN75AVOA datasheet(14/40 Pages) MICROCHIP

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TCN75A

DS21935D-page 14

 2010 Microchip Technology Inc.

5.3

Registers

The

TCN75A

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 TCN75A outputs an alert signal using the

ALERT pin (refer to Section 5.3.4.3 “ALERT Output

Configuration”

). The device Configuration register

provides access for the user to configure the TCN75A’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 TCN75A 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 additional 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

Pointer

bits

= Temperature register (TA)

= Configuration register (CONFIG)

= Temperature Hysteresis register (THYST)

= Temperature Limit-set register (TSET)

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