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DATA SHEET
Communication to the DSP or the EEPROM will be possible as long as the input AC voltage is provided. If no AC is present,
communication to the unit is possible as long as it is connected to a life V 1 output (provided e.g. by the redundant unit). If
only V SB is provided, communication is not possible.
Table 7 - I 2 C / SMBus Specification
PARAMETER
V iL
V iH
V hys
V oL
t r
t of
I i
C i
DESCRIPTION
Input low voltage
Input high voltage
Input hysteresis
Output low voltage
Rise time for SDA and SCL
Output fall time ViHmin ? ViLmax
Input current SCL/SDA
Internal Capacitance for each SCL/SDA
CONDITION
3 mA sink current
10 pF < C b1 < 400 pF
0.1 VDD < Vi < 0.9 VDD
MIN
-0.5
2.3
0.15
0
20+0.1C b1
20+0.1C b1
-10
MAX
1.0
5.5
0.4
300
250
10
50
UNIT
V
V
V
V
Ns
Ns
μA
pF
f SCL
R pu
SCL clock frequency
External pull-up resistor
f SCL ≤ 100 kHz
0
100
1000 ns / C b1
kHz
?
t HDSTA
t LOW
t HIGH
t SUSTA
Hold time (repeated) START
Low period of the SCL clock
High period of the SCL clock
Setup time for a repeated START
f SCL ≤ 100 kHz
f SCL ≤ 100 kHz
f SCL ≤ 100 kHz
f SCL ≤ 100 kHz
4.0
4.7
4.0
4.7
μs
μs
μs
μs
t HDDAT
t SUDAT
t SUSTO
t BUF
Data hold time
Data setup time
Setup time for STOP condition
Bus free time between STOP and START
f SCL ≤ 100 kHz
f SCL ≤ 100 kHz
f SCL ≤ 100 kHz
f SCL ≤ 100 kHz
0
250
4.0
5
3.45
μs
ns
μs
ms
1
Cb = Capacitance of bus line in pF, typically in the range of 10…400 pF
Figure 34 - I2C / SMBus Timing
t of
t LOW
t HIGH
t LOW
t r
SDA
t SUSTA
t HDSTA
t HDDAT t SUDAT
t SUSTO
t BUF
SCL
8.13 ADDRESS/PROTOCOL SELECTION (APS)
The APS pin provides the possibility to select the communication protocol and address by connecting a resistor to V 1 return
(0 V). A fixed addressing offset exists between the Controller and the EEPROM.
NOTE
- If the APS pin is left open, the supply will operate with the PSMI protocol at controller / EEPROM addresses 0xB6 / 0xA6.
- The ASP pin is only read at start-up of the power supply. Therefore it is not possible to change the communication protocol
and address dynamically.
PFE850-12-054xA
14
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