Silan

Semiconductors

SC9149A/SC9150A

HANGZHOU SILAN MICROELECTRONICS CO.,LTD.

Rev: 1.2

2003.01.21

11

To make code bit to “1” on SC9148A, connect diode to CODE terminal from T1~T3 terminal. To set Code bit “0” ,

open the circuit.

SC9149A has C2 and C3 code terminal. Code bit of C1 has been pulled up in IC and C1 is always kept at “1”

status.

Therefore, on transmitter SC9148A it is necessary to keep C1 code bit at “1” . Example 1 is the external circuit

diagram when Code bit C2=1 and C3=0.

2. COMBINATION OF SC9148A/SC9150A CODE BITS

CODE

T3

(C3)

T2

(C2)

T1

(C1)

Code1

(C1)

Code2

(C2)

VDD

VDD

OSC

Code:

C1=C3=1,C2=0

Code:

C1=1,C2=0

SC9148A

SC9150A

13

12

11

10

21

22

15

16

K1~K10

SP1~SP10

Example 2 (C1=1 and C2=0)

The combination of code bits of SC9148A and SC9150A is shown in the following table.

SC9148A

SC9150A

C1

C2

C3

C2

C3

1

0

1

1

0

0

1

1

0

1

1

1

1

1

1

On SC9150A, C3 code has been pulled up in IC and always kept at “1” status. Therefore , it is necessary to keep

Code Bit C3 of transmitter SC9148A at “1”. To keep Code Bit C3 at “1”, connect a diode to CODE terminal from T3

terminal.

4. Note for Input Signal

10k

Ω in series to Rx Input terminal in order to prevent latch-up. expect SC9149AHN. Other circuit should be

connect as following: output signal of infrared receiver should be inversed, and then input RXIN port.