sx8645 Semtech Corporation, sx8645 Datasheet - Page 70

• Manufacturer Part Number: sx8645
• Description: Ultra Low Power, Capacitive Button And Wheel Touch Controller 12 Sensors With Enhanced Led Drivers
• Manufacturer: Semtech Corporation

ADVANCED COMMUNICATIONS & SENSING
6.6 SPM Gateway Registers
The SX8645 I2C interface offers two registers for exchanging the SPM data with the host.
• SpmCfg
• SpmBaseAddr
The exchange of data, read and write, between the host and the SPM is always done in bursts of eight bytes.
The base address of each burst of eight bytes is a modulo 8 number, starting at 0x00 and ending at 0x78.
The registers SpmKeyMsb and SpmKeyLsb are required for NVM programming as described in section 6.7.
Revision 7_5, February 10
Address
Address Name
Address
Address Name
0x0E
0xAC
0xAD
0x0D
SpmBaseAddr
SpmKeyMsb
Name
SpmKeyLsb
Name
SpmCfg
Bits
7:6
5:4
3
2:0
Bits
7:0
Bits
7:0
Bits
7:0
Table 35
Description
00: Reserved
Enables I2C SPM mode
00: OFF (default)
01: ON
10: Reserved
11: Reserved
Defines r/w direction of SPM
0: SPM write access (default)
1: SPM read access
000: Reserved
Description
SPM to NVM burn Key MSB
Description
SPM to NVM burn Key LSB
Table 36 SPM Base Address
Touch Controller (12 sensors) with Enhanced LED Drivers
© 2010 Semtech Corp.
Table 37
Table 38
Description
SPM Base Address (modulo 8).
The lowest address is 0x00 (default).
The highest address is 0x78.
SPM access configuration
SPM Key MSB
SPM Key LSB
70
Ultra Low Power, Capacitive Button and Wheel
Unlock requires writing data: 0x62
Unlock requires writing data: 0x9D
DATASHEET
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SX8645