MCP960X datasheet(40/57 Pages) MICROCHIP

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DS20005426G-page 40

MCP960X/L0X/RL0X

5.3.3

ALERT CONFIGURATION

REGISTERS

This device integrates four individually controlled

temperature alert outputs. Each output is configured for

the corresponding alert output using the Alert Output

Configuration registers.

The Configuration registers are used to enable each

output, select the Alert Function mode as Comparator

or Interrupt mode, active-high or active-low output,

detect rising or falling temperatures and detect TH or

TC Temperature registers.

The Comparator mode is useful for thermostat-type

applications, such as on/off switches for fan controllers,

buzzer or LED indicators. The alert output asserts and

deasserts when the temperature exceeds the

user-specified limit, and the user-specified hysteresis

limit. The Interrupt mode is useful for interrupt driven

microcontroller-based systems. The alert outputs are

asserted each time the temperature exceeds the

user-specified alert limit and hysteresis limits.

The microcontroller will have Acknowledged the

interrupt signal from the corresponding alert output by

clearing the interrupt using bit 7 of the corresponding

Configuration register.

The Rise/Fall bit (bit 3) and the Monitor TH/TC bit (bit 4)

can be used to detect and maintain the thermocouple

temperature or the cold-junction temperature to the

desired temperature window.

TABLE 5-6:

ALERT CONFIGURATION

REGISTERS

Alert 1 Configuration

0000 1000

Alert 2 Configuration

0000 1001

Alert 3 Configuration

0000 1010

Alert 4 Configuration

0000 1011

ALERT 1, 2, 3 AND 4 CONFIGURATION REGISTER

R/W-0

U-0

R/W-0

Interrupt Clear

—

Monitor TH/TC

Rise/Fall

Active-High/Low Comp/Int. Alert Enable

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

Interrupt Clear: Interrupt Clear bit

1 = Clears Interrupt flag (forced ‘0’ by device)

0 = Normal state or cleared state

bit 6-5

Unimplemented: Read as ‘0’

bit 4

Monitor TH or TC: Temperature Maintain/Detect bit

1 = Alert monitor for TC cold-junction sensor

0 = Alert monitor for TH thermocouple temperature

bit 3

Rise/Fall: Alert Temperature Direction bit

1 = Alert limit for falling or cooling temperatures

0 = Alert limit for rising or heating temperatures

bit 2

Active-High/Low: Alert State bit

1 = Active-high

0 = Active-low

bit 1

Comp./Int.: Alert Mode bit

1 = Interrupt mode: Interrupt clears bit (bit 7) – must be set to deassert the alert output

0 = Comparator mode

bit 0

Alert Enable: Alert Output Enable bit

1 = Alert output is enabled

0 = Alert output is disabled

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