SX8661 datasheet(77/88 Pages) SEMTECH

tên linh kiện	SX8661

Giải thích chi tiết về linh kiện	Low Power, Capacitive Button Touch and Proximity Controller

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ADVANCED COMMUNICATIONS & SENSING

DATASHEET

Revision v3.2, January 2011

www.semtech.com

SX8661

Low Power, Capacitive Button Touch and Proximity Controller

(8 sensors) with LED Drivers and Analog Output

6.6.2

SPM Read Sequence

The SPM must always be read in blocks of 8 bytes. The sequence is described below:

1. Set the I2C in SPM mode by writing “01” to SpmCfg[5:4] and SPM read access by writing ‘1’ to SpmCfg[3].

2. Write the SPM base address to SpmBaseAddr (The base address needs to be a value modulo 8).

3. Read the eight consecutive bytes from I2C address 0, 1, 2, …7

4. Terminate by writing “000” to SpmCfg[5:3].

Figure 59

SPM Read Sequence

The complete SPM can be read by repeating 16 times the cycles shown in Figure 59 using base addresses 0x00,

0x08, 0x10,…0x70, 0x78.

Once the SPM read sequence is actually applied, the INTB pin will be asserted. The host clears the interrupt by

reading any I2C register. At the same time the bit GenStatMsb[6], indicating the SPM write is done, will be

cleared.

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