EMC1813 datasheet(25/102 Pages) MICROCHIP

25 / 102 page

For CPU substrate transistors that require the BJT transistor model, the ideality factor behaves slightly

differently than for discrete diode-connected transistors. Refer to the following when using a CPU

substrate transistor.

Table 5-8. Substrate Diode Ideality Factor Look-Up Table (BJT Model)

Setting

Factor

Setting

Factor

Setting

Factor

08h

0.9869

18h

1.0079

28h

1.0291

09h

0.9882

19h

1.0092

29h

1.0304

0Ah

0.9895

1Ah

1.0105

2Ah

1.0317

0Bh

0.9908

1Bh

1.0120

2Bh

1.0330

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

5.16

Diode Faults

The EMC1812/13/14/15/33 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.

Multi-Channel Low-Voltage Remote Di...

System Block Diagram

Datasheet

DS20005751A-page 25

EMC1813 Datasheet(PDF) 25 Page - Microchip Technology

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