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W925E625FG Datasheet(PDF) 5 Page - Winbond |
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W925E625FG Datasheet(HTML) 5 Page - Winbond |
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5 / 75 page  W925E/C625 Publication Release Date: July 4, 2005 - 5 - Revision A10 4. PIN DESCRIPTION SYMBOL I/O DESCRIPTION TEST/MODE I/O 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. 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 /VPP I RESET pin. A low pulse causes the whole chip reset. In E version, this pin work as VPP 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 O 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 VSS, the time interval is the RC time constant. CAP O Must be connected 0.1 µF capacitor to VSS. VREF O Reference Voltage. Nominally, VDD/2 is used to bias the input of the gain control op-amp. GCFB1 O 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. INN1 I Inverting Input of the gain control op-amp1. INP1 I Non-inverting Input of the gain control op-amp1. GCFB2 O 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. INN2 I Inverting Input of the gain control op-amp2. INP2 I Non-inverting Input of the gain control op-amp2. VAD I Analog voltage supply. VAS I Analog ground. VDD I Digital voltage supply. VSS I Digital ground. XOUT1 O Output pin for main-oscillator. Connected to 3.58MHz crystal for CID function. XIN1 I Input pin for main-oscillator. Connected to 3.58MHz crystal for CID function. XOUT2 O Output pin for sub-oscillator. Connected to 32.768KHz crystal only. Suggest to add an external capacitor about 10~30pF to ground (VSS) for the accuracy of the oscillator. |
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