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HCMS-3902 Datasheet(PDF) 8 Page - Agilent(Hewlett-Packard) |
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HCMS-3902 Datasheet(HTML) 8 Page - Agilent(Hewlett-Packard) |
8 / 22 page 8 Electrical Description Pin Function Description RESET (RST) Sets Control Register bits to logic low. The Dot Register contents are unaffected by the Reset pin. (logic low = reset; logic high = normal operation). DATA IN (DIN) Serial Data input for Dot or Control Register data. Data is entered on the rising edge of the Clock input. DATA OUT (DOUT) Serial Data output for Dot or Control Register data. This pin is used for cascading multiple displays. CLOCK (CLK) Clock input for writing Dot or Control Register data. When Chip Enable is logic low, data is entered on the rising Clock edge. REGISTER SELECT (RS) Selects Dot Register (RS = logic low) or Control Register (RS = logic high) as the destination for serial data entry. The logic level of RS is latched onthe falling edge of the Chip Enable input. CHIP ENABLE (CE) This input must be a logic low to write data to the display. When CE returns to logic high and CLK is logic low, data is latched to either the LED output drivers or a Control Register. OSCILLATOR SELECT Selects either an internal or external display oscillator source. (SEL) (logic low = External Display Oscillator; logic high = Internal Display Oscillator). OSCILLATOR (OSC) Output for the Internal Display Oscillator (SEL = logic high) or input for an External Display Oscillator (SEL = logic low). BLANK (BL) Blanks the display when logic high. May be modulated for brightness control. GNDLED Ground for LED drivers. GNDLOGIC Ground for logic. VLED Positive supply for LED drivers. VLOGIC Positive supply for logic. |
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Similar Description - HCMS-3902 |
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