SA9109B Ver la hoja de datos (PDF) - South African Micro Electronic Systems
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componentes Descripción
Fabricante
SA9109B
South African Micro Electronic Systems
SA9109B Datasheet PDF : 18 Pages
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SA9109B
R3, R6 and R4 set the current for the voltage sense input. The values should be selected
so that the input current into the voltage sense input (virtual ground) is set to 14µARMS.
R7 defines all on-chip bias and reference currents. With R7 = 24kΩ, optimum conditions
are set. R may be varied within ±10% for calibration purposes. Any change to R will
7
7
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.
+ 2 .5 V
BAT
R 10
C9
C7
C6
D1
R8
0V
C 10
R 11
T A R IF F SE L EC T
R 12
D2
- 2 .5 V
LOA D
R3
R1
R SH
R2
C5 R4
R6
R7
C2
C1
C3
D IS PL A Y
SELEC T
C4
6 5 4 3 2 1 44 43 42 41 40
7
39
8
38
9
37
10
IC - I
36
11
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12
34
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14
SA 9109B
33
32
15
31
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- 2 .5 V
R9
XTA L
PG M
PD TA
PC LK
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N E G A T IV E T 1 T 2 T 3 T 4 T O T A L
0V
SU PPLY
D R -0 125 8
sames
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