3-53

TELCOM SEMICONDUCTOR, INC.

7

6

5

4

3

1

2

8

5V PRECISION DATA ACQUISITION

SUBSYSTEMS

TC530

TC534

Figure 1. Serial Port Timing

R/W

READ TIMING

READ FORMAT

WRITE FORMAT

WRITE TIMING

WRITE DEFAULT TIMING

EOC

R/W

EOC

EOC

SGN MSB

LSB

OVR

R/W

R/W

R/W

MSB

LSB

For Polled vs Interrupt Operation and Write Value Modified Cycle Use TC520A Data Sheet Figure 1 & 2.

PIN DESCRIPTION (Cont.)

Pin No.

Pin No.

Pin No

Pin No.

(TC530

(TC530

(TC534

(TC534

28-Pin

28-Pin

40-Pin

44-Pin

PDIP, 300 Mil.) SOIC)

PDIP)

PQFP)

Symbol

Description

22

22

32

30

Analog Input. Power supply connection for digital logic and

serial port. Proper power-up sequencing is critical, see the

Applications section.

23

23

34

32

OSC

Input. The negative power supply converter normally runs at

a frequency of 100kHz. This frequency can be slowed down to

reduce quiescent current by connecting an external capacitor

25

25

37

35

Analog Input. Power supply connection for the A/D analog

section and DC-DC converter. Proper power-up sequencing is

critical, see the

Applications section.

26

26

38

36

Analog Input. Storage capacitor positive connection for the

DC/DC converter.

27

27

39

37

AGND

Analog Input. Ground connection for DC/DC converter.

28

28

40

38

Analog Input. Storage capacitor negative connection for the

DC/DC converter.

13, 24

13, 24

28, 29, 31, 1, 25, 26, 27

NC

No connect. Do not connect any signal to these pins.

33, 35, 36

29, 31, 33,

34, 39, 44,