BL59A12/BL59S12
8.Application sample figure
VDD
VDD
R8*
D1
C4
BT1
VDD
6.
8k
R9*
C1
C2
4.7n
R11
R10*
D2
47uF
47n
R14
9V
TEST
R7
5k
6.8K
1
2
3
C1
C2
Test
LowSupplyTrip
Vss
R1
Osc
LED
Freedback
SILVER
16
15
14
13
12
11
10
9
R5*
R1
R2
C3
VDD
10
0
K
250K
IR
Detector
4.
7
R12
VDD
D3
A
Detect
Strobe
Vdd
IRED
Ｉ／Ｏ
Brass
7.5M
100K
R3
R6
4
5
6
7
8
1500pf
D4
A
U2
C6
1k
C5
VDD
Q1
47
K
Visible
LED
100uF
IR
Emitter
R13*
470
R4*
4.7to22
100K
0.01uf
2.2M
BUZZE
R
3
2
1
com
9. Calibration:
To enter calibration mode, pin16 (TEST) must be below VSS, pulling more than 100uA
continuously out of the pin for at least one OSC cycle. To exit this mode, the TEST pin is floated
at least one OSC cycle.
Table. Configuration of pins in the calibration mode
Description PIN
Comments
Forcing this pin = VDD, places photo amp’s output on pin2 when pin15=
I/O
7
VDD, or on pin1 when pin15= VSS.
Low:
normal gain of photo amplifier on pin1.
Low-supply 15
High:
supervisory gain on pin2.
When pin15=low, driving it high enables gain with a hysteresis in the
Feedback
10
photo amp.
OSC
12
It equals to internal clock.
This pin becomes smoke comparator’s output. Positive pulses indicate
Silver
9
that smoke has been detected. A static low level indicates no smoke.
This pin becomes the smoke integrator’s output. Static high level means
Brass
8
two consecutive smoke detections. Static low level means two
no-detections.
http://www.belling.com.cn
-6-
8/28/2006
Wrote by 2006
Total
8 Pages
BELLING [ SHANGHAI BELLING CO., LTD. ]
