AS2702 – AS-Interface Slave IC

Revision 1.3, 21-Aug-08

Page 8 of 13

•

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.

Parameter out

Data in

t

STB

t

t

PSTBn

t

INPmin

t

INPmax

Px

Px

PSTBn

Parameter out

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

Min

Max

Unit

Note

tSTB

Delay PSTBn HL-edge to Px output data valid

1.5

µs

tPSTBn

PSTBn strobe width

6

6.8

µs

1

tINP

Input data valid time window

10.5

12.5

µs

2

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

The dc-parameters of the parameter port pins P3, …, P0 are specified as follows:

Symbol

Parameter

Min

Max

Unit Note

IOUTLO

Sink current @ output L

10

mA VOUT = 1V

IOUTHI

Leakage current @ output off

-10

10

µA

VOUT = 5V

IOUTHI7

Leakage current @ output off; pull-up current source off

-1

1

µA

VOUT = 5V; IO-conf. = 7

IINLO

Input current @ VIN = 1V

-5

-20

µA

1