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WM8750-EV1M Datasheet(PDF) 11 Page - Wolfson Microelectronics plc |
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WM8750-EV1M Datasheet(HTML) 11 Page - Wolfson Microelectronics plc |
11 / 48 page WM8750-EV1M w Rev 2.0, February 2005 11 To operate the WM8750 in 2-wire mode, jumper switch SW4 must be set so that pins 2 and 3 are SHORT. The 2-wire serial interface becomes active on pins 31(SDIN) and 32(SCLK). The serial interface on the board can be connected to a PC via the printer port or any other standard parallel port. Note: a bi-directional parallel port is required for 2-wire operation 1. The 2-wire data and clock lines may also be connected to the board via the test points TP4 (SDIN) and TP3 (SCLK). When used in 2-wire mode, the WM8750 has two possible addresses (0011010 [0x34h] or 0011011 [0x36h]) that are selectable by pulling CSB low or high. If connecting a probe to the Test Points it must be noted that the CSB line is pulled high on the WM8750 evaluation board selecting address 0011011. CSB must be pulled low or driven low through the software writes if address 0011010 is used (as is done in the WM8750-EV1S software provided). SDIN SCLK ACK R ADDR ACK DATA B15-8 STOP START DATA B7-0 R/W ACK Figure 3 2-Wire Serial Interface Note: 1If the 2-wire mode does not operate as expected, the likely cause is the configuration of the parallel port interface mode. Check that the port is configured for bi-directional communication. Most PCs allow the parallel port to be configured in the BIOS settings during initial PC power up. |
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