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WM8750-EV1M

Evaluation Board User Handbook

Wolfson Microelectronics plc 

WM8750-EV1M

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

operation1. 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

R ADDR

R/W

ACK

DATA B15-8 ACK

DATA B7-0

ACK

SCLK

START

STOP

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.

w

Rev 2.0, February 2005

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