MIC184 Ver la hoja de datos (PDF) - Micrel

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componentes Descripción

Fabricante

MIC184

Local/Remote Thermal Supervisor

Micrel 

MIC184

Functional Diagram

2:1

MUX

Bandgap

Sensor

1-Bit

and

DAC

Reference

TEMPERATURE-TO-DIGITAL

CONVERTER

Digital Filter

and

Control

Logic

A2/T1

A1

A0

DATA

CLK

2-Wire

Serial Bus

Interface

MIC184

Pointer

Register

Result

Register

Temperature

Setpoint

Register

Temperature

Hysteresis

Register

Configuration

Register

State

Machine

and

Digital

Comparator

Thermostat

Output

INT

Micrel

Functional Description

Pin Descriptions

VDD

Power supply input. See electrical specifications.

GND

Ground return for all MIC184 functions.

CLK

Clock input to the MIC184 from the two-wire serial bus. The

clock signal is provided by the bus 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 bidirectional and has an open-drain output driver.

An external pull-up resistor or current source somewhere in

the system is necessary on this line. This line is shared by

all devices on the bus.

A2/T1, A1, A0

These inputs set the three least significant bits of the MIC184’s

7-bit slave address. Each MIC184 will only respond to its own

unique slave address, allowing the use of up to eight MIC184s

on a single bus. A match between the MIC184’s address and

the address specified in the serial bit stream must be made

to initiate communication. A1 and A0 should be connected

directly to VDD or ground. When A2/T1 is used as an address

bit input, it should also be tied to VDD or ground. A2/T1 can

alternatively connect to a remote temperature sensor. When

A2/T1 is used for temperature measurements, an off-chip di-

ode junction must be connected between A2/T1 and ground. In

this case, internal circuitry will detect A2 as logic low, leaving

four possible slave addresses. See “Temperature Measure-

ment” and “Power On” for more information. A2/T1, A1, and

A0 determine the slave address as shown in Table 1.

INT

Temperature events are indicated to external circuitry via this

output. INT may be configured as active-low or active-high

by the host. Operation of the INT output is controlled by the

MODE and POL bits in the MIC184’s configuration register.

See “Comparator and Interrupt Modes” below. This output

is open-drain and may be wire-ORed 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 set, it prevents the INT output from sinking current. In

I2C and SMBus systems, the IM bit is therefore an interrupt

mask bit.

MIC184

6

May 2006

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