EMC1428 datasheet(38/53 Pages) MICROCHIP

38 / 53 page

1°C Multiple Temperature Sensor with HW Thermal Shutdown & Hottest of Thermal Zones

Data Sheet

DS20005275A-page 38

 2014 Microchip Technology Inc.

Bits 7-4 - Ex_MSK - Prevents the ALERT pin from being asserted when the External Diode X channel

is out of limit or reports a diode fault. If the EXT6_APD bit is not set (see Section 5.23), then the

EXT7_MSK bit is ignored. Likewise, if the EXT4_APD bit is not set, then the EXT5_MSK bit is ignored.



‘0’ - The External Diode X channel will cause the ALERT pin to be asserted if it is out of limit or

reports a diode fault.



‘1’ (default) - The External Diode X channel will not cause the ALERT pin to be asserted if it is out

of limit or reports a diode fault.

Bits 3-1- Ex_MSK - Prevents the ALERT pin from being asserted when the External Diode X channel

is out of limit or reports a diode fault. If the EXT2_APD bit is not set (see Section 5.23), then the

EXT3_MSK bit is ignored.



‘0’ - (default) The External Diode X channel will cause the ALERT pin to be asserted if it is out of

limit or reports a diode fault.



‘1’ - The External Diode X channel will not cause the ALERT pin to be asserted if it is out of limit

or reports a diode fault.

Bit 0 - INT_MSK- Prevents the ALERT pin from being asserted when the Internal Diode temperature

is out of limit.



‘0’ (default) - The Internal Diode channel will cause the ALERT pin to be asserted if it is out of limit.



‘1’ - The Internal Diode channel will not cause the ALERT pin to be asserted if it is out of limit.

5.14

Consecutive ALERT Register

The Consecutive ALERT Register determines how many times an out-of-limit error or diode fault must

be detected in consecutive measurements before the interrupt status registers are asserted.

Each out of limit error and diode fault condition has its own counter associated with it. Each counter

is incremented whenever the corresponding channel exceeds the appropriate limit. Additionally, each

counter is reset if the condition has been removed. (i.e. if External Diode 1 exceeds its high limit, it

will increment the high counter. If, on the next measurement, it experiences a diode fault, the high limit

counter will be reset and the diode fault counter will be incremented).

When the ALERT pin is configured as an interrupt and the consecutive alert counter reaches its

programmed value then the STATUS bit(s) for that channel and the error condition will be set to ‘1’

and the ALERT pin will be asserted. Measurements will continue normally.

When the ALERT pin is configured as a comparator, the consecutive alert counter will ignore diode

fault and low limit errors and only increment if the measured temperature meets or exceeds the High

Limit. Additionally, once the consecutive alert counter reaches the programmed limit, the ALERT pin

will be asserted, but the counter will not be reset. It will remain set until the temperature drops below

the High Limit minus the THERM Hysteresis value.

For example, if the CALRT[2:0] bits are set for 4 consecutive alerts on an EMC1428 device, the high

limits are set at 70°C, and none of the channels are masked, then the status bits will be asserted after

the following four measurements:

Table 5.17 Consecutive ALERT Register

ADDR.

R/W

DEFAULT

22h

R/W

Consecutive

ALERT

TIME

OUT

CTHE

RM2

CTHE

RM1

CTHE

RM0

CAL

RT2

CAL

RT1

CAL

RT0

70h

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