SA9110AFA Ver la hoja de datos (PDF) - South African Micro Electronic Systems
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SA9110AFA
South African Micro Electronic Systems
SA9110AFA Datasheet PDF : 18 Pages
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SA9110A
6. Optical Interface
The SA9110A device contains an interface for automatic meter reading, according
to the IEC1107 Mode D standard. The IEC1107 Mode D is a single baud rate of
2400. For the optical interface protocol, the 4-bit words are converted to 8-bit words
(ASCII-format).
After initiation of a serial transmission by pulling PB (pin 66) low, the data format
transmitted on SDO, is given below:
Code
/
XXX
3
YYYYYYYY
<cr><lf><cr><lf>
0(nnnnnnnn)
1(nnnnnnnn)
2(nnnnnnnn)
3(nnnnnnnn)
4(nnnnnnnn)
!<cr><lf><cr><lf>
Description
Start transmission
ID
Baud rate identification
ID
Data header
Data of Reg. 1 (sign, 10e5, 10e4 ...10e0, 10e-1)
Data of Reg. 2
Data of Reg. 3
Data of Reg. 4
Data of Reg. 'Total' = Sum of registers 1 to 4
End transmission
7. Power Failure/Battery Backup
A battery backup facility is available on VBA. This feature is provided to ensure
retention of the information stored in the registers, in case of power breaks.
The VSS supply to the analog circuitry and digital circuitry has been separated. In
the event of a power failure, the supply to the analog circuitry falls to 0V. The digital
circuitry is switched to a power down mode, to minimise the supply current from an
external battery backup. During this procedure, the following events take place:
• All inputs are disabled
• All outputs are placed in high impedance mode
• The oscillator is inhibited
• The LCD driver is disabled
• The contents of the RAM is retained by means of an external power source.
8. Electrostatic Discharge (ESD) Protection
The SA9110A integrated circuits inputs/outputs are protected against ESD.
9. Power Consumption
The power consumption rating of the SA9110A integrated circuit is less than 40mW
with a 5V supply.
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