U6057B

TELEFUNKEN Semiconductors

Rev. A1, 03-Dec-97

Preliminary Information

2 (9)

Pin Configuration

Table 1. Pin description

Pin

Symbol

Function

1

GND

Ground

2

DIN

Serial data input

3

nc

4

P/S

Parallel/serial switch-over

5

CLK

Clock input for shift register

6

nc

7

DOUT

Serial data output for the

mC

8

nc

9

2/4

2/4-fold comparison

10

SYN

Synchronization

11

CO

Clock output for cascading

12

PP

Program pin

13

DT

Data input of data line

14

nc

15

nc

16

nc

17

nc

18

OCS

RC-oscillator input

19

Stabilized voltage

20

Supply voltage

1

2

3

4

5

6

7

8

10

9

19

18

17

16

14

15

13

12

11

20

P/S

CLK

13272

nc

DOUT

nc

2/4

DIN

nc

nc

nc

nc

nc

DT

PP

OSC

SYN

CO

GND

U6057B

Figure 2. Pinning of U6057B

Functional Description

Power Supply

For protection against interference and surges, the

U6057B must be equipped with an RC-circuit for current

limitation in the event of overvoltages and for buffering

Suggested dimensions: Rv = 510

(see figure 3 )

GND.

Oscillator

All timing in the circuit is derived from an RC-oscillator.

integrated 2-k

W resistor. Since the tolerance and

temperature sensitivity of the integrated resistor are

considerable greater than those of the external resistor,

W.

Recommended frequencies and dimensioning:

W)

W

Table 2. Times derived from the transmitted frequency

(6.4 kHz)

Description

Time

Start pulse

312

ms

One bit

156

ms

Information bit

156

ms

Zero bit

156

ms

Information unit

625

ms

Data word

5 ms + 312

ms start bit

Data pause

9.688 ms

Transmission cycle

15 ms

Minimum reaction time

60 ms

Data word master – slave

10 ms + 312

ms start bit

Data pause master – slave

4.688 ms