EMC6D100 datasheet(21/75 Pages) SMSC

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Environmental Monitoring and Control Device

Datasheet

SMSC EMC6D100/EMC6D101

Page 21

Rev. 09-09-04

DATASHEET

Chapter 6 Hardware Monitoring

The following sub-sections describe the Hardware Monitoring Block.

6.1

Input Monitoring

The EMC6D100/EMC6D101 Device’s monitoring function is started by writing a ‘1’ to the START bit in the

Ready/Lock/Start Register (0x40). Measured values from the analog inputs and temperature sensors are

stored in Reading Registers. The values in the reading registers can be accessed via the SMBus interface.

These values are compared to the programmed limits in the Limit Register. The out-of-limit and diode fault

conditions are stored in the Interrupt Status Registers.

Note: All limit and parameter registers must be set before the START bit is set to ‘1’. Once the start bit is set, these

registers become read-only.

6.2

Resetting the Hardware Monitoring Block

6.2.1

POWER ON RESET

All the registers in the Hardware Monitor Block, except the reading registers, reset to a default value when

power is applied to the block. The default state of the register is shown in the table in the Register

Summary subsection. The default state of Reading Registers are not shown because these registers have

indeterminate power on values.

Note: Usually the first action after power up is to write limits into the Limit Registers.

6.2.2

SOFT RESET (INITIALIZATION)

Setting bit 7 of the CONF register performs a soft reset. This bit is self-clearing. Soft Reset performs reset

on all the registers except the Reading Registers.

6.3

Monitoring Modes

The Hardware Monitor Block supports two Monitoring modes: Continuous Mode and Cycle Mode. These

modes are selected using bit 1 of the Special Function Register (7Ch). The following subsections contain

a description of these monitoring modes.

For each mode, there are two options for the number of measurements that are performed on each

temperature and voltage reading. These options are selected using bit 5 of the special function register

(7Ch). These options are as follows:

128 measurements are averaged for the remote diode temperature reading and 8 measurements are averaged

for all voltage and the internal temperature reading.

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