MCP960X datasheet(37/57 Pages) MICROCHIP

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DS20005426G-page 37

MCP960X/L0X/RL0X

5.3

Temperature Alert Registers

This device provides four Temperature Alert registers

that are individually configured, which allow users to

monitor multiple temperature zones with a single

device. The following sections describe each alert

feature in detail.

5.3.1

ALERT LIMIT REGISTERS

This device integrates four individually controlled

Temperature Alert Limit registers. Each alert limit is

individually set to detect a rising or falling temperature,

or either the Thermocouple Temperature (TH) register

or the Cold-Junction (TC) register. The corresponding

alert limit outputs can also be enabled for temperature

status indicators. All alert functions are configured using

the Alert Limit Configuration registers (Register 5-11)

and the alert output hysteresis function is set using the

Alert Hysteresis registers (Register 5-10).

FIGURE 5-8:

Alert Limits Set to Detect TH and TC.

TABLE 5-4:

ALERT LIMIT REGISTERS

Alert 1 Limit – TALERT1

0001 0000

Alert 2 Limit – TALERT2

0001 0001

Alert 3 Limit – TALERT3

0001 0010

Alert 4 Limit – TALERT4

0001 0011

ALERT LIMITS 1, 2, 3 AND 4 REGISTERS

R/W-0

SIGN

1024°C

512°C

255°C

128°C

64°C

32°C

16°C

bit 15

bit 8

R/W-0

U-0

8°C

4°C

2°C

1°C

0.5°C

0.25°C

—

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 15-0

Alert 1, 2, 3 and 4: Data in Two’s Complement Format. Bit 15 is the sign bit and it is set when the

temperature data is less than 0°C. Bits 1 and 0 are unimplemented, therefore, writing these bits has

no effect.

Alert Limit

Alert Hysteresis

TH/TC

+/–

Rise/Fall

Digital Comparator

Output Mode Control

Comparator/Interrupt Mode

Int. Clear

Alert Output

Active High/Low

Comparator

Interrupt

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