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W83L785R Datasheet(PDF) 10 Page - Winbond |
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W83L785R Datasheet(HTML) 10 Page - Winbond |
10 / 22 page W83L785R/W83L785G - 6 - 6. FUNCTIONAL DESCRIPTION 6.1 General Description The W83L785R/G provides most 4 analog positive inputs, 2 fan speed monitors, 2 sets for fan PWM (Pulse Width Modulation) control, 2 remote thermal inputs from remote thermistors or 2N3904 transistors or Pentium TM II (Deschutes) thermal diode outputs. W83L785R/G also provides software power down this chip to save power, but I2C interface is still working. When W83L785R/G starts the monitor function on the chip, the Watch Dog machine monitors every function and store the value to registers. If the monitor value exceeds the limit value, the interrupt status will be set to 1. 6.2 Access Interface The W83L785R/G provides I 2C Serial Bus to read/write internal registers. In the W83L785R/G, the I2C address defined value is 0101101. 6.2.1 The first serial bus access timing is shown as follow: (a) Serial bus write to internal address register followed by the data byte 0 Start By Master 01011 01 D7 D6 D5 D4 D3 D2 D1 D0 Ack by 785R R/W Ack by 785R SCL SDA D7 D6 D5 D4 D3 D2 D1 D0 Ack by 784R Stop by Master SCL SDA (Continued) 78 0 7 8 0 78 Frame 2 Internal Index Register Byte (Continued) Frame 3 Data Byte Frame 1 Serial Bus Address Byte Figure 1. Serial Bus Write to Internal Address Register followed by the Data Byte Ack by 785R (b) Serial bus read form internal address register followed by the data byte 0 Start By Master 0 1011 01 D7 D6 D5 D4 D3 D2 D1 D0 ack by 785R R/W ack by 785R D7 D6 D5 D4 D3 D2 D1 D0 Ack by 784R Stop by Master 78 0 7 8 Frame 2 Internal Index Register Byte Frame 4 Data Byte Frame 1 Serial Bus Address Byte Figure 2. Serial Bus read from Internal Address Register followed by the Data Byte 01234567801 345 26 7 1 01 1 00 1 R/W 8 ack by 785R Frame 3 Serial Bus Byte ack by 785R SCL SDA SCL(Continued) SDA(Continued) |
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