User's Manual
Table Of Contents
- 1 Ordering Information
- 2 Block Diagram and Descriptions
- 3 Electrical Characteristics
- 4 WT32 Pin Description
- 5 Power Control
- 6 Serial Interfaces
- 7 Audio Interfaces
- 8 I/O Parallel Ports
- 9 Software Stacks
- 10 Enhanced Data Rate
- 11 Layout and Soldering Considerations
- 12 WT32 Physical Dimensions
- 13 Package
- 15 RoHS Statement with a List of Banned Materials
- 16 Contact Information
6
Terminal characteristics
Min Typ Max Unit
I/O voltage levels
V
IL
input logic level low -0.4 - 0.25xVDD V
V
IH
input logic level high 0.625xVDD - Vdd + 0.3 V
V
OL
output logic level low 0 - 0.125 V
V
OH
output logic level high 0.75xVDD - VDD V
Reset terminal
V
TH,res
threshold voltage 0.64 0.85 1.5 V
R
IRES
input resistance 220
kΩ
C
IRES
input capacitance 220 nF
Input and tri-state current with
Strong pull-up -100 -40 -10
µΑ
Strong pull-down 10 40 100
µΑ
Weak pull-up -5 -1 -0.2
µΑ
Weak pull-down 0.2 1 5
µΑ
I/O pad leakage current -1 0 1 µΑ
LED driver pad
Off current - 1 2 µΑ
On resistance (V
PAD
< 0.5 V) - 20 33
Ω
On resistance, pad enabled by battery charger
(V
PAD
< 0.5 V)
- 20 50
Ω
Ta ble 3 : Term inal charact erist ics