SX8663 datasheet(59/64 Pages) SEMTECH

tên linh kiện	SX8663

Giải thích chi tiết về linh kiện	Capacitive Button Matrix (up to 36) and Proximity Controller with Individual LED Drivers and Buzzer Output

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59 / 64 page

ADVANCED COMMUNICATIONS & SENSING

Rev5 4

th August 2011

www.semtech.com

SX8663

Capacitive Button Matrix (up to 36) and Proximity Controller

with Individual LED Drivers and Buzzer 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 52

SPM Read Sequence

The complete SPM can be read by repeating 16 times the cycles shown in Figure 52 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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