EMC1822 datasheet(28/103 Pages) MICROCHIP

28 / 103 page

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Setting

Factor

Setting

Factor

Setting

Factor

0Ch

0.9921

1Ch

1.0132

2Ch

1.0343

0Dh

0.9934

1Dh

1.0146

2Dh

1.0356

0Eh

0.9947

1Eh

1.0159

2Eh

1.0369

0Fh

0.9960

1Fh

1.0173

2Fh

1.0382

10h

0.9973

20h

1.0187

30h

1.0395

11h

0.9986

21h

1.0200

31h

1.0408

12h

1.0000

22h

1.0213

32h

1.0421

13h

1.0013

23h

1.0226

33h

1.0434

14h

1.0026

24h

1.0239

34h

1.0447

15h

1.0039

25h

1.0252

35h

1.0460

16h

1.0053

26h

1.0265

36h

1.0473

17h

1.0066

27h

1.0278

37h

1.0486

7.15

Diode Faults

The EMC1822/23/24/25/43 devices detect an open on the DP and DN pins, and a short across the DP

and DN pins. For each temperature measurement made, the device checks for a Diode Fault on the

external diode channel(s). When a Diode Fault is detected, the ALERT pin asserts (unless masked) and

the temperature data reads 00h in the MSB and LSB registers (note that the low limit is not be checked).

A Diode Fault is defined as one of the following: an open between DP and DN, a short from VDD to DP, or

a short from VDD to DN.

If a short occurs across DP and DN or a short occurs from DP to GND, the low limit Status bit is not set

and the ALERT pin does not assert. This condition is indistinguishable from a temperature measurement

of 0.000°C (-64°C in extended range) resulting in temperature data of 00h in the MSB and LSB registers.

If a short from DN to GND occurs (with a diode connected), temperature measurements will continue as

normal with no alerts.

7.16

Consecutive Alerts

The EMC1822/23/24/25/43 device family contains multiple consecutive alert counters. One set of

counters applies to the ALERT pin and the second set of counters applies to the THERM pin. Each

temperature measurement channel has a separate consecutive alert counter for each of the ALERT and

THERM pins. All counters are user programmable and determine the number of consecutive

measurements that a temperature channel(s) must be out-of-limit or reporting a Diode Fault before the

corresponding pin is asserted.

The Consecutive Alert register determines how many times an out-of-limit error or Diode Fault must be

detected in consecutive measurements before the ALERT or THERM pin is asserted.

Multi-Channel Low Voltage Temp Sens...

System Block Diagram

Datasheet

DS20006048A-page 28

EMC1822 Datasheet(PDF) 28 Page - Microchip Technology

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