Rev. 1.20

3

June 17, 2016

HT7M2126/27/36/56/76

Interface & Pin Assignment – Stand-alone Mode

Pin #

Function

Description

1

VSS

Negative power supply, GND

2

VDD

Positive power supply

3

STATUS

Warm-up/Detecting/Low voltage status

4

TRO

PIR trigger output

5

FTS

Photo transistor signal

6

VSS

Negative power supply, GND

7

MODE/DT

Mode & Duration time Selection

8

TP1

No connection (Test pin)

ThedefaultconfigurationsfortheStand-aloneModeareasfollow:

1. Continuous trigger mode

2. The TRO pin will output a high pulse signal when an available trigger is detected. The high pulse duration is

of0.22μF.

RA+RT Resistance (Ω)

1.8K

2.2K

2.7K

3K

3.3K

3.6K

3.9K

TRO output duration time *

3sec.

10sec.

38sec.

1mins.

3mins.

5mins.

10mins.

(b) The value of the resistance, capacitance and TRO output duration time in the above table is used for ref�

erence only.

3. The STATUS pin will output various types of signals corresponding to the device in the warm�up mode, standby

detection mode or low operating voltage mode where the operating voltage is lower than 2.7V respectively.

(a) Warm-upmode:Atoggleoutputwithafrequencyof2.5HzwillbeoutputontheSTATUSpin.

STATUS

(f=2.5Hz)

(b) Standy detection mode: A signal composed of a low pulse of 10ms and a high pulse of 4s will continuously

be output on the STATUS pin.

STATUS

10ms

10ms

4s

4s

10ms

Output signal

(c)Lowvoltagemode:Twolowpulseswithawidthof10mswillfirstbeoutputontheSTATUSpinandthe

time duration between these two low pulses is 80ms. Then a high pulse with the width of 1 second will con�

secutively be output. Such an output signal will continuously be output on the STATUS pin.

STATUS

10ms

10ms

1s

80ms

10ms

10ms

80ms

10ms

1s

10ms

80ms

1s

Output signal