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SX8661 Datasheet(PDF) 77 Page - Semtech Corporation

Part # SX8661
Description  Low Power, Capacitive Button Touch and Proximity Controller
PDF  88 Pages
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Manufacturer  SEMTECH [Semtech Corporation]
Direct Link  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SX8661 Datasheet(HTML) 77 Page - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Revision v3.2, January 2011
© 2011 Semtech Corp.
www.semtech.com
77
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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