SA9109B

sames

15/18

R

so that the input current into the voltage sense input (virtual ground) is set to 14µA

R

are set. R

Any change to R

affect the energy calculation quadratically.

XTAL is a colour burst TV crystal (f = 3.5795MHz) for the oscillator. The oscillator

frequency is divided down to 1.7897MHz on-chip to supply the digital circuitry and the

A/D converters.

Figure 1: Application Circuit using a Shunt Resistor for Current Sensing.

4

BAT

D1

D2

IC - I

SA 9109B

20

C4

R3

C5

R4

RSH

SU PPL Y

0V

DR- 0 1 2 5 8

19

18

17

R2

R1

R6

9

10

C1

C3

14

13

12

11

16

15

7

8

6

5

C2

- 2 .5 V

LOA D

R1 1

R1 0

+2 .5 V

C1 0

0V

R7

C7

C9

C6

PG M

.

.

N E G A TIV E T 1 T2 T 3 T4

T O TA L

.

.

.

.

28

27

26

25

24

23

22

21

29

37

36

35

34

33

32

30

31

3

2

41

42

1

44 43

40

38

39

XT A L

.

.

.

.

.

.

.

.

R9

PD T A

PC L K

T ARIF F SE L ECT

DIS PL A Y

SE LEC T

- 2 .5 V

R8

R1 2