W925E240 Datasheet, PDF (5/73 Pages) Winbond – 8-BIT CID MICROCONTROLLER

W925E/C240
4. PIN DESCRIPTION
NAME
TEST/MODE
EA /DATA
RESET /VPP
RNGDI
RNGRC
CAP
VREF
GCFB1
INN1
INP1
GCFB2
INN2
INP2
VAD
VAS
V_DD
V_SS
XOUT1
XIN1
I/O
I/O
I, I/O
I
I
O
O
O
O
I
I
O
I
I
I
I
I
I
O
I
DESCRIPTION
TEST pin. In E version (EEPROM type), it works as a Mode pin to select
programming mode. In C version (Mask type), this pin with internal pull-
low resistor.
Set high for normal function. In E version, it works as a 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
works as a VPP pin, which is a supply programming voltage. In C version,
this pin with internal pull-high resistor.
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 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.
Must be connected 0.1µF capacitor to V_SS.
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
connecting this pin and the INN1 pin with feedback resistor. It is
recommended that the op-amp1 be set to unity gain.
Inverting Input of the gain control op-amp1.
Non-inverting Input of the gain control op-amp1.
Op-amp2 Feed-back Gain Control signal. Select the input gain by
connecting this pin and the INN2 pin with feedback resistor. It is
recommended that the op-amp2 be set to unity gain.
Inverting Input of the gain control op-amp2.
Non-inverting Input of the gain control op-amp2.
Analog voltage supply.
Analog ground.
Digital voltage supply.
Digital ground.
Output pin for main-oscillator. Connected to 3.58MHz crystal for CID
function.
Input pin for main-oscillator. Connected to 3.58MHz crystal for CID
function.
Publication Release Date: July 12, 2005
-5-
Revision A10