ViewSonic E95 - Page 48

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ViewSonic Corporation i nesters meena =
E95-1 circuit descripti
POWER SAVING
According to E2000 agreement with monitor manufacturer is as the following table:
INPUT PRESENTED
MODE NORMAL STAND-BY POWER OFF
a |=
SIGNAL
SW1: 1C301 pin24, suspend (SUS)
SW2: IC301 pin23, power down (PD)
- The suspend mode occurs when SW1 is at low level.
The 15V, 12V, -15V are switch off via Q201 Q202 / Q205 Q206.
- The power-off mode occurs when SW1 and SW2 are at low level.
The switchine power is turn off and all output are at low output.
- The micro-processor IC301 are drived to power off mode when signal cable is not connected to PC.
MICRO-CONTROLLER UNIT (MCU) (1C301)
1C301 is a 8-bit micro-controller (D1678P40) with 16K byte ROM memory, which play
a main role of the digital control monitor. It performs as mode timing detector, key control scanner and
controller, DPMS power saving handling, on screen display programmer and
auto-alignment geometry controller pinl6/17 are for key control. Pin1/40/39 are for s-correction switch
control.by IC303 Pin8/9 are for Horizontal and Vertical sync. input respectively. Pin6/7 is the V-sync. and
horizontal-sync output to pinl4/15 of IC401. Pin39/38 are serial clock and serial data (SCL/SDA) bus
communicate with IC302 (EEPROM) pin6/5. Pinl16(DSDA)/17 (DSCL) are as a port to communicate with DDC
1/2B access and auto alignment port. by signal cable. Pin21 (U-SDA) / 22(U-SCL) / 20(U-INT) are USB bus.
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