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7.3 Block diagram of the I 2 C option
Refer to Fig 7-1 for description of the I 2 C block diagram and for typical application.
A0
A1
A2
REGISTER
A0
A1
A2
ADC
Output Fail
OTP
Temperature Alarm
Fan Fail
AC Input Fail
Output voltage
Output current
Temperature
A0
A1
A2
Fig 7-1: I 2 C option bloack diagram
A0
A1
A2
EEPROM
Serial CLOCK
Serial DATA
7.4 Operation and functions
7.4.1. Digital status
Digital status functions are provided by a PCF8574, 8-bit Register. It provides a single 8-bit word when read by the
I 2 C controller. Fault is indicated by "1" and Good level is indicated by "0".
Refer to Table 7-1 for the register information.
BIT
FUNCTION MEANING
0
1
2
3
4
5
6
7
Output Fail
Over Temperature Protection
Temperature Alarm
Fan Fail
AC Input Fail
Not Used
Not Used
Not Used
Output voltage is <80% +/- 5% of Vout rated
Internal temperature is over 80 ° C. Supply turns off.
Internal temperature is over 70 ° C. Supply is on.
Failure of an internal fan.
AC Input <85Vac
Always "0".
Always "0".
Always "0".
Table 7-1
PCF8574 slave address:
Bit
Value
7
0
6
1
5
0
4
0
3
A2
2
A1
1
A0
0
R/W
7.4.2 EEPROM functions
A 256 bytes EEPROM included in the I 2 C option. The EEPROM type is AT24C02 and it is programmed at the factory
with the data shown in Table 7-2.
ADDRESS BYTES
DATA
0
4
20
40
56
72
88
104
254
4
16
20
16
16
16
16
16
2
Number of fields
Manufacturer
Serial number
Revision
Country of manufacture
Model name
Output voltage
Date of manufacture
Checksum
Table 7-2
The slave EEPROM address is:
Bit 7 6
Value 1 0
5
1
4
0
3
A2
2
A1
1
A0
0
R/W
20
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