U8C3525

Preliminary

LINEAR INTEGRATED CIRCUIT

UNISONICTECHNOLOGIESCO.,LTD

6 of 6

www.unisonic.com.tw

QW-R126-048.a

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CIRCUIT DESCRIPTION

The U8C3525 is an 8-Bit Serial-In Parallel-Out driver for Solenoid valve. The state of outputs Drain0 ~ Drain7 are

controlled by the latch data Q20~Q27 and OE signal. When OE is high, if a channel corresponding data latch is 1,

then the channel output is turned on, the switch from the output terminal to ground in the ON state.

U8C3525’s constant current technology make The maximum output current limited to around 250mA,which can

effectively prevent the chip or peripheral devices from damaging caused by load short. If a channel corresponding

data latch is 0, the output channel is switched off, in a high impedance state. When OE is low, no matter what the

value of the latch data, the output channels are turned off. It can withstand high voltage above 35V when the outputs

are turned off.

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OPEN/SHORT DETECTION

channel in Open state or short state, the chip can be detected in time and quickly Shutdown the load shorted

channel which the chip from can overheating and external load. The test results stored to the shift register when OE

Falling edge .It can be removed from SDO end of the serial at SCLK action reading back to the controller.

The controller will read back the data before sending out now Control data for comparison, if exactly the same, it

means the load in good condition, no open short circuit, if a bit of data sent out is 1, 0 read back ,it indicates that the

corresponding channel bit data load short circuit occurs, if a bit of data to send out is 0, 1 read back, the table Shows

the bit data corresponding to the channel occurred Open load.

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