Power One SFP450 Series, Руководство по программированию

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Title
Issued 2006-05-19 SKl
Modified -- --
Mech. Eng. approved -- --
Marketing approved
SFP450/600 I
2
C Interface Programming
Manual
Mfg. approved --
Size Scale Sheet Drawing No. Revision
www.power-one.com
A4 13/21
BBA20005-G 001
Supersedes: -
5.2.1 Status Byte definition
Explanation
Bit 0 PS present = 0 (True) False = 1 This Signal indicates that the PS is present.
Bit 1 PW OK = 1 (PS OK) Fault = 0 Output Power Good, signalized that all outputs
are valid.
Bit 2 AC OK = 0 (OK) Fault = 1 AC in specified range.
Bit 3 OC +12V = 1 (PS OK) Fault = 0 +12 V Over Current goes low when it exceeds
the current rating. The output will be latched.*
Bit 4 UV+12V,UV+3V3SBY = 1
(PS OK) Fault = 0 +12V Under Voltage goes low, when +12V
dips under the specified voltage and shuts
down the Unit. The Output will be latched.*
Or the 3.3VSBY has an Under Voltage.
Bit 5 OV +12V = 1 (PS OK) Fault = 0 +12V Over Voltage goes low, when +12V
trips over the specified voltage and shuts down
the unit. The Output will be latched. *
Bit 6 ALERT = 1 (PS OK) Fault = 0 The Alert signal goes high, if one of the fans
falls below a threshold speed value or an OTP
occurs.
Bit 7 OTP = 1(PS OK) Fault=0 The Over Temperature Protection circuit has
shut down the unit.
Table for status information
*Latched states can only be cleared by recycling AC mains or toggling PS_ON.
5.2.2 Voltage/current data interpretation
The voltage and current monitor can be accessed with the commands 0x02 and 0x03. The values are
returned in an unsigned 10bit number which is left justified. For the voltage measuring the resolution is
20mV/bit and for the current resolution is 50mA/bit.
Example of a voltage measuring:
Bit 7
Bit 0 Bit 7 Bit 0
1 0 0 1 0 1 1 0 0 0 x x x x
First byte 1 Second byte
This gives the value: 10’0101’1000
BIN
=258
HEX
=600
DEZ
The measured voltage is 600
DEZ
*20mV/bit= 12000 mV
7 0
MS first read
7 6
LS 5 0
Second read
10 bit value