MIC384 datasheet(6/21 Pages) MICREL

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MIC384

Micrel

MIC384

September 2000

Functional Description

Pin Descriptions

VDD: Power supply input. See electrical specifications.

GND: Ground return for all MIC384 functions.

CLK: Clock input to the MIC384 from the two-wire serial bus.

The clock signal is provided by the host, and is shared by all

devices on the bus.

DATA: Serial data I/O pin that connects to the two-wire serial

bus. DATA is bi-directional and has an open-drain output

driver. An external pull-up resistor or current source some-

where in the system is necessary on this line. This line is

shared by all devices on the bus.

A0: This inputs sets the least significant bit of the MIC384’s

7-bit slave address. The six most-significant bits are fixed

and are determined by the part number ordered. (See order-

ing information table above.) Each MIC384 will only respond

to its own unique slave address, allowing up to eight MIC384’s

to share a single bus.

A match between the MIC384’s

address and the address specified in the serial bit stream

must be made to initiate communication. A0 should be tied

directly to VDD or ground. See "Temperature Measurement

Functional Diagram

3:1

MUX

8-Bit Sigma-Delta ADC

∑

∫

1-Bit

DAC

DATA

VDD

MIC384

CLK

/INT

2-Wire

Serial Bus

Interface

Temperature

Hysteresis

Registers

State

Machine

and

Digital

Comparator

Digital Filter

and

Control

Logic

Open-Drain

Output

Configuration

Bandgap

Sensor

and

Reference

Result

Registers

Temperature

Setpoint

Registers

GND

Pointer

and Power On" for more information. A0 determines the slave

address as shown in Table 1:

Table 1. MIC384 Slave Address Settings

/INT: Temperature events are indicated to external circuitry

via this output. Operation of the /INT output is controlled by

the MODE and IM bits in the MIC384’s configuration register.

See "Comparator and Interrupt Modes" below. This output is

open-drain and may be wire-OR’ed with other open-drain

signals. Most systems will require a pull-up resistor or current

source on this pin. If the IM bit in the configuration register is

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