W925EP01 Datasheet, PDF (5/108 Pages) Winbond – 8-BIT CID MICROCONTROLLER

W925EP01/ W925EP01FG
4. PIN DESCRIPTION
SYMBOL
RNGDI
RNGRC
CAP
VREF
GCFB1
INN1
INP1
GCFB2
INN2
INP2
VAD
VAS
VDD
VSS
XOUT1
XIN1
XOUT2
XIN2
EA
I/O
FUNCTION
I
Ring Detect Input (Schmitt trigger input). Used for ring detection and line
reversal detection. Must maintain a voltage between VAD and VAS.
Ring RC (Open drain output and Schmitt trigger input). Used to set the time
O
interval from the end of RNGDI pin to the inactive condition of the RNGON
pin. An external resistor must be connected to VAD and a capacitor
connected to VSS, the time interval is the RC time constant.
O Must be connected 0.1uF capacitor to VSS.
O
Reference Voltage. Nominally, VDD/2 is used to bias the input of the gain
control op-amp.
Op-amp1 Feed-back Gain Control signal. Select the input gain by
O connecting this pin and the INN1 pin with feedback resistor. It is
recommended that the op-amp1 be set to unity gain.
I Inverting Input of the gain control op-amp1.
I Non-inverting Input of the gain control op-amp1.
Op-amp2 Feed-back Gain Control signal. Select the input gain by
O connecting this pin and the INN2 pin with feedback resistor. It is
recommended that the op-amp2 be set to unity gain.
I Inverting Input of the gain control op-amp2.
I Non-inverting Input of the gain control op-amp2.
I Analog voltage supply.
I
Analog ground.
I Digital voltage supply.
I
Digital ground.
O
Output pin for main-oscillator. Connected to 4M/8MHz crystal for CID
function.
I Input pin for main-oscillator. Connected to 4M/8MHz crystal for CID function.
Output pin for sub-oscillator. Connected to 32.768KHz crystal only. Suggest
O to add an external capacitor about 10~30pF to ground (VSS) for the
accuracy of the oscillator.
Input pin for sub-oscillator. Connected to 32.768KHz crystal only. Suggest
I to add an external capacitor about 10~30pF to ground (VSS) for the
accuracy of the oscillator.
EXTERNAL ACCESS ENABLE. Set high for normal function. Set low for
external mode running; P5~P6/A0~A15 and A16 are external address bus,
I
P7/D0~D7 are external data bus, and ^PSEN pin is always emits pulses
during access to external ROM. This pin with internal pull-high resistor.
Publication Release Date: Apr. 10, 2006
-5-
Revision A2