EMC1822 datasheet(22/103 Pages) MICROCHIP

22 / 103 page

Figure 7-2. 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

7.8

Power States

The EMC1822/23/24/25/43 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.

7.9

Conversion Rates

The EMC1822/23/24/25/43 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.

Table 7-4. Conversion Rate

CONV<3:0>

Conversions/ Second

HEX

1/16

1/8

1/4

1/2

Multi-Channel Low Voltage Temp Sens...

System Block Diagram

Datasheet

DS20006048A-page 22

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