SX8661Z datasheet(75/87 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

6.6.2

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].

0x0D

0x18

S,Sr

: Start condition

: Slave address

: Slave acknowledge

: Not Acknowledge (terminates read stream)

: NVM Base Address

RDn

: Read Data byte n, n = 0 to 7

: Stop condition

From master to slave

From slave to master

0x0E

0x0D

0x00

RD0

... RD7

Figure 57

SPM Read Sequence

The complete SPM can be read by repeating 16 times the cycles shown in Figure 57 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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