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Pad Controller (PADCON)

Introduction#

Pads of W7500 are controllable. User can control padโ€™s characteristic.

Features#

  • W7500 have digital I/O pads and digital/analog mux I/O pads
  • Controllable characteristics of pad are pull-up, pull-down, driving strength, input enable and CMOS/Schmitt trigger input buffer
  • Each pad can be control individually by register.

Functional description#

The below Figure shows the function schematic of digital I/O pad of W7500.

The below Figure shows the function schematic of digital/analog mux IO pad of W7500

Initials of Pad diagram is same as below.

P - PAD
YA โ€“ Analog Input (connect to ADC input)
Y โ€“ Digital Input
IE โ€“ Input buffer enable

ConditionAYP
Input buffer enable
(IE =1)
Output modeOUTOUTOUT
Input modeNo useININ
Input buffer enable
(IE = 0)
Output modeOUTLow(0)OUT
Input modeNo useININ

CS โ€“ CMOS/Schmitt trigger input buffer select
PU โ€“ Pull-up enable
A โ€“ Digital Output
DS โ€“ Driving strength select

ConditionRise/Fall Time(nSec)Propagation Delay(nSec)
Driving StrengthCapacitance loadingMinMaxMinMax
High
(DS = 1)
25pF418727
100pF11531144
Low
(DS = 0)
25pF18416
100pF4237

PD โ€“ Pull-down enable

User can set pad condition with IE, CS, PU/PD, DS by register.
And pads are can be controlled individually.