EMC1822 datasheet(16/103 Pages) MICROCHIP

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System Block Diagram

The figure below shows a system-level block diagram of the EMC1822/23/24/25/43 .

Figure 7-1. EMC1822/23/24/25/43 System Diagram

CPU/GPU

EMC18XX

Host

SDA

Thermal

Junction

SCL

SMBus

Interface

ALERT/THERM

SYS_SHDN

Power Control

VDD

GND

VDD = 1.62V-3.6V

1.8V-2.75V

DN2/DP3

DP2/DN3

7.1

Temperature Measurement

The EMC1822/23/24/25/43 device family can monitor the temperature of up to four externally-connected

diodes. Each external diode channel is configured with Resistance Error Correction and Beta

Compensation based on user settings and system requirements.

The devices contain programmable high, low and therm limits for all measured temperature channels. If

the measured temperature goes below the low limit or above the high limit, the ALERT pin can be

asserted (based on user settings). If the measured temperature meets or exceeds the therm limit, the

THERM pin is asserted unconditionally, providing two tiers of temperature detection.

7.2

Temperature Measurement Results and Data

The temperature measurement results are stored in the internal and external temperature registers.

These are then compared with the values stored in the high- and low-limit registers. Both external and

internal temperature measurements are stored in 11-bit format with the eight Most Significant bits (MSb)

stored in a high-byte register and the three Least Significant bits (LSb) stored in the three MSB positions

of the low-byte register. All other bits of the low-byte register are set to zero.

The EMC1822/23/24/25/43 family has two selectable temperature ranges. The default range is from 0°C

to +127°C and the temperature is represented as a binary number able to report a temperature from 0°C

to +127.875°C in 0.125°C steps.

The extended range is an extended temperature range from -64°C to +191°C. The data format is a binary

number offset by 64°C. The extended range is used to measure temperature diodes with a large known

offset (such as CPU/GPU processor diodes) where the diode temperature plus the offset would be

equivalent to a temperature higher than +127°C.

The following table shows the default and extended range formats.

Multi-Channel Low Voltage Temp Sens...

System Block Diagram

Datasheet

DS20006048A-page 16

EMC1822 Datasheet(PDF) 16 Page - Microchip Technology

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