SX8661Z datasheet(74/87 Pages) SEMTECH

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ADVANCED COMMUNICATIONS & SENSING

DATASHEET

Revision v4.0, February 2016

www.semtech.com

SX8661Z

Low Power, Capacitive Button Touch and Proximity Controller

(8 sensors) with LED Drivers and Analog Output

6.6.1

SPM Write Sequence

The SPM must always be written 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 write access by writing ‘0’ to SpmCfg[3].

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

3. Write the eight consecutive bytes to I2C address 0, 1, 2, …7

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

0x0D

0x10

: Start condition

: Slave address

: Slave acknowledge

: NVM Base Address

WDn

: Write Data byte n, n = 0 to 7

: Stop condition

...

From master to slave

From slave to master

0x0E

0x00

WD0

WD7

0x0D

0x00

Figure 56

SPM write sequence

The complete SPM can be written by repeating 16 times the cycles shown in Figure 56 using base addresses

0x00, 0x08, 0x10,…0x70, 0x78.

Once the SPM write 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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