AS2702_1 Datasheet, PDF (8/13 Pages) ams AG – AS-Interface Slave IC

AS2702 – AS-Interface Slave IC
• output, or
• input
depending on the IO-configuration code, written and stored in the slave device.
The timing of the data transfer is presented in Figure 4.
Strobe signal PSTBn flags and governs the data transfer as follows:
a) parameter port is set ‘output’:
output data become valid upon the HL-edge of the strobe and will remain so until the next HL-edge, hence during the entire
strobe cycle;
b) parameter port is set ‘input’:
input data to be valid within a specific time window relative to the HL-edge of the strobe, after completion of the strobe’s L-
phase.
Output data as per a) could be easily latched with the LH-edge of strobe PSTBn, if at all necessary.
Px t
STB
Parameter out
Parameter out
Px
PSTBn
t + t _PSTBn
OUTOFF
t
PSTBn
t
INPmin
t_INPmax
Data in
Figure 4 Timing of data transfer at parameter port P3, …, P0 relative to strobe PSTBn
The following table specifies the timing parameters relating to Figure 4:
Symbol Parameter
tSTB
Delay PSTBn HL-edge to Px output data valid
tPSTBn PSTBn strobe width
tINP
Input data valid time window
Notes:
1 Pulse width depends substantially on value of external pull-up resistor
2 Timing reference is PSTBn HL-edge.
Applies only to parameter port set to 'input' operation
Min
Max
Unit Note
1.5
µs
6
6.8
µs 1
10.5
12.5
µs 2
The dc-parameters of the parameter port pins P3, …, P0 are specified as follows:
Symbol Parameter
Min
IOUTLO Sink current @ output L
10
IOUTHI Leakage current @ output off
-10
IOUTHI7 Leakage current @ output off; pull-up current source off
-1
IINLO
Input current @ VIN = 1V
-5
Max Unit Note
mA VOUT = 1V
10 µA VOUT = 5V
1
µA VOUT = 5V; IO-conf. = 7
-20 µA 1
Revision 1.3, 21-Aug-08
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