Rev. 1.20

10

June 17, 2016

HT7M2126/27/36/56/76

Appendix A – Communication Protocol

Protocol definitions

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

IICA6

IICA5

IICA4

IICA3

IICA2

IICA1

IICA0

R/W

1

0

0

1

1

0

0

x

Register Pointer

HOST_CMD

Bit7

Bit6

Bit5

Bit4

Bit3

Bit2

Bit1

Bit0

D7

D6

D5

D4

Pointer Bit

Bit 7~4

D7~D4:Writablebits,mustbefixedat“0”

Bit7~4mustalwaysbeclearedorwrittento“0”.Thisdevicehasadditionalregistersthatare

reserved for test and calibration. If these registers are accessed, the device may not perform

accordingtothespecification.

Bit 3~0

Pointer Bits:

0000=Configstandbywithdetectingmode

0001=Configurationregister(CONFIG)

0010=Configmoduleaddress

0011=ConfigTrigtimeinterval

0100 = EEPROM access

0101 = PIR A/D RAW data

0110 = Optical sensor A/D RAW data

0111 = Temperature sensor A/D RAW data

1000 = Trig register

1001 = Manufacture ID

1010 = Device ID/Revision register

1011 =Testresultinquire

1100 = Reset test result

Note: Some registers contain calibration codes and should not be accessed. Accessing these registers could cause

permanent sensor decalibration.