STCC05-B STMicroelectronics, STCC05-B Datasheet - Page 4

• Manufacturer Part Number: STCC05-B
• Description: Home appliance control circuit
• Manufacturer: STMicroelectronics

Specifications of STCC05-B

• Wide Range Input Supply Voltage Operation: 7 to 18V
• Ambient Temperature: - 20 to 85°C

STCC05-B
■
The MCU can excite a warning buzzer with a 50% PWM signal. The buzzer driver amplifies this signal in
current and translates it from the 5V MCU output to the V
the buzzer.
The output stage is made of a NPN transistor, a PNP transistor and two 1kΩ resistors.
The NPN transistor, referred to the power ground COM, is controlled by the input IN
nected to the output BZ
The PNP transistor, referred to the V
nected to the output BZ
buffer.
The pin BZ
PWM section runs from 10Hz up to 5kHz.
A 1kΩ resistor R
over, the addition of an external capacitor-resistor network on BZ
off smoothly when the pin EN
■
The OUT
Effect sensor or a door switch signal and is transmitted to the MCU. As the IN
spike suppressor and a simple EMI filter are added to increase the input robustness. The output signal
OUT
4/13
The buzzer driver with enable control
The speed sensor level shifter
S
IN
is not inverted with respect to the input signal IN
I
S
Demagnetizing Diode
signal is generated by an electronic signal such as the indoor fan speed clock issued of a Hall
2
IN
10 kΩ
is the supply terminal of the buzzer; and the circuit has a DC current rating of 9mA and the
4 kΩ
S
BZ
is connected between the BZ
V
IN
1
2
. The input IN
through a 1kΩ resistor. The input EN
V
50 kΩ
BZ
PS
50 kΩ
Transistor
is toggling.
Relay
50 kΩ
PS
BZ
polarity, is controlled by the input EN
is driven by a simple push-pull MCU buffer.
RL
I
1
V
and BZ
DD
Filter
S
EMI
.
2
PS
pins to discharge the buzzer periodically. More-
supply to produce the right sound level from
EN
IN
BZ
BZ
BZ
2
V
pin will allow the buzzer to turn on and
DD
is driven by a simple push-pull MCU
10 kΩ
500Ω
V
IN
S
BZ
input may be disturbed; a
; and its collector is con-
BZ
V
OUT
PS
; its collector is con-
R
R
OH
BZ
= 1kΩ
=
S
1kΩ
BZ
BZ
2
1