HT7M2136 datasheet(18/25 Pages) HOLTEK

18 / 25 page

Rev. 1.20

June 17, 2016

HT7M2126/27/36/56/76

• Temperature sensor Specifications

Symbol

Parameter

Condition

Min.

Typ.

Max.

Unit

VDD

Analog Voltage

—

2.7

—

5.5

VREFO

Bandgap output voltage

No load @ 3V

-3%

1.04

+3%

VTPS

Temperature Sensor Voltage

—

-10%

0.91

+10%

Tslope

Temp. sensor Slope

—

3.12

—

mV/°C

Note:Thisisanexampleroutine:(SeeAppendixB:“SourceCode”)

i2c_start();

// send START command

i2c_write(AddressByte & 0xFE); // WRITE Command

// also, make sure bit 0 is cleared ‘0’

i2c_write(0x07);

// Write TSRAW Register

i2c_start();

// send Repeat START command

i2c_write(AddressByte | 0x01); // READ Command

// also, make sure bit 0 is set ‘1’

UpperByte = i2c_read(ACK);

// READ 8 bits (UpperByte = High 4bit)

// and Send ACK bit

LowerByte = i2c_read(NAK);

// READ 8 bits (LowerByte = Low 8bit)

// and Send NAK bit

8. Module Status

• MODULE STATUS → ADDRESS: 08H

Bit

Name

Ini

—

LVD

R/W

—

Bit

Name

BLumi

—

Fnoise

Fagtrg

Ftrg

R/W

—

Bit 15

Ini

1: module initialing/module initial failed

0: module initial ok

Bit 14~9

Unimplemented read as 0

Bit 8

LVD

1: Low Voltage Detect

0: No Low Voltage Detect

Bit 7

BLumi

1: Night, darkness detected

0: Day, brightness detected

Bit 6~3

Unimplemented read as 0

Bit 2

Fnoise

1: PIR noise detected

0: No PIR noise detected

Bit 1

Fagtrg

1: PIR trig again (notice: This bit can be trig when Trig mode = 1)

0: No PIR trig again

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