EMC1812 datasheet(19/102 Pages) MICROCHIP

19 / 102 page

5.8

External Diode Connections

The EMC1812 can be configured to measure a CPU substrate transistor, a discrete 2N3904 thermal

diode, or an CPU/GPU processor diode. The diodes can be connected as indicated in the figure below.

The EMC1813 can be configured to measure a CPU substrate transistor, a discrete 2N3904 thermal

diode, or an CPU/GPU processor diode on the External Diode 1 or External Diode 2 channels. For the

EMC1814, External Diode 2 and External Diode 3 channels are configured to measure a pair of discrete

anti-parallel diodes (shared on pins DP2 and DN2). The supported configurations for the external diode

channels are shown in the following figure.

Figure 5-2. Diode Configurations

Local

Ground

DP1

Typical remote

substrate transistor

e.g. CPU substrate

PNP

Typical remote

discrete NPN transistor

e.g. 2N3904

DN1

to DP2/DN3

to DN2/DP3

Anti-parallel connected

discrete NPN transistors

e.g. 2N3904

DP1

DN1

5.9

Power States

The EMC1812/13/14/15/33 devices have two power states: Active and Standby.

•

Active (Run) - In this state, the ADC is converting on all temperature channels at the programmed

conversion rate. The temperature data is updated at the end of every conversion and the limits are

checked. In the Active state, writing to the One-shot register has no effects.

•

Standby (One-shot) - While the device is in Standby, the host can initiate a conversion cycle on

demand. After the conversion cycle is complete, the device returns to the Standby state.

5.10

Conversion Rates

The EMC1812/13/14/15/33 devices may be configured for different conversion rates based on the system

requirements. The default conversion rate is four conversions per second. Other available conversion

rates are shown in the Conversion Rate table.

Multi-Channel Low-Voltage Remote Di...

System Block Diagram

Datasheet

DS20005751A-page 19

EMC1812 Datasheet(PDF) 19 Page - Microchip Technology

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