W925E625 Datasheet, PDF (5/75 Pages) Winbond – 8-bit CID MICROCONTROLLER

W925E/C625
4. PIN DESCRIPTION
SYMBOL I/O
DESCRIPTION
TEST pin. In E version (EEPROM type), it works as a Mode pin to select
TEST/MODE I/O programming mode. In C version (Mask type), this pin with internal pull-low
resistor.
EA /DATA
I,I/O
Set high for normal function. In E version, it works as Data pin. In C version,
this pin with internal pull-high resistor.
RESET pin. A low pulse causes the whole chip reset. In E version, this pin
RESET /V_PP ^{I work as V}PP ^{pin, which is a supply programming voltage. In C version, this pin}
with internal pull-high resistor.
RNGDI
I
Ring Detect Input (Schmitt trigger input). Used for ring detection and line
reversal detection. Must maintain a voltage between VAD and VAS.
RNGRC
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 connected to VAD and a capacitor connected
to V_SS, the time interval is the RC time constant.
CAP
O Must be connected 0.1µF capacitor to V_SS.
VREF
O
Reference Voltage. Nominally, V_DD/2 is used to bias the input of the gain
control op-amp.
GCFB1
Op-amp1 Feed-back Gain Control signal. Select the input gain by connecting
O this pin and the INN1 pin with feedback resistor. It is recommended that the
op-amp1 be set to unity gain.
INN1
I Inverting Input of the gain control op-amp1.
INP1
I Non-inverting Input of the gain control op-amp1.
GCFB2
Op-amp2 Feed-back Gain Control signal. Select the input gain by connecting
O this pin and the INN2 pin with feedback resistor. It is recommended that the
op-amp2 be set to unity gain.
INN2
I Inverting Input of the gain control op-amp2.
INP2
VAD
VAS
V_DD
V_SS
XOUT1
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 3.58MHz crystal for CID function.
XIN1
XOUT2
I Input pin for main-oscillator. Connected to 3.58MHz 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 (V_SS) for the accuracy
of the oscillator.
Publication Release Date: July 4, 2005
-5-
Revision A10