EMC1822 datasheet(13/103 Pages) MICROCHIP

13 / 103 page

5.1

Power Supply (VDD)

This pin is used to supply power to the device.

5.2

Diode 1 Pair (DN1/DP1)

Remote Diode 1 anode (DP1) and cathode (DN1) pins.

5.3

System Shutdown

The EMC1822/23/24/25/43 devices contain a hardware configured temperature limit circuit that controls

the SYS_SHDN pin. The threshold temperature is determined by the pull-up resistors on both the

SYS_SHDN and ALERT pins. Note, Standby and One-shot modes cannot be enabled in device

configurations including system shutdown functionality .

The final temperature decode is the responsibility of the digital block. The overall decode is shown in

Table 7-3.

The Hardware Shutdown circuitry measures the External Diode 1 Channel and compares it against the

Hardware Thermal Shutdown Limit. The THERM pin consecutive alert counter (default 4 for the

SYS_SHDN pin) applies to this comparison. If the temperature meets or exceeds the limit for the number

of consecutive measurements, the SYS_SHDN pin is asserted. The SYS_SHDNpin remains asserted

until the temperature drops below the limit minus 10°C. As well, all of the measurement channels

(including the External Diode 1 channel) can be configured to assert theSYS_SHDN pin. If a channel is

configured to assert the SYS_SHDN pin, the temperature on the measured channel must exceed the

programmed therm limit value. This is treated in the same way as the THERM output.

5.4

Ground (GND)

This pin is used to ground the device.

5.5

Maskable ALERT (ALERT/THERM2)

This pin asserts when a diode temperature exceeds the ALERT threshold. This pin may be masked by

5.6

SMBus/I2C Data (SDA)

This is the open-drain, bidirectional data pin for SMBus communication.

5.7

DP/DP1

•

DP/DP1: DP and DP1 anode

5.8

DN/DN1

•

DN/DN1: DN and DN1 cathode

Multi-Channel Low Voltage Temp Sens...

Pin Descriptions

Datasheet

DS20006048A-page 13

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