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SX8661Z датащи(PDF) 76 Page - Semtech Corporation

номер детали SX8661Z
подробное описание детали  Low Power, Capacitive Button Touch and Proximity Controller with LED Drivers and Analog Output
PDF  87 Pages
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производитель  SEMTECH [Semtech Corporation]
домашняя страница  http://www.semtech.com
Logo SEMTECH - Semtech Corporation

SX8661Z датащи(HTML) 76 Page - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Revision v4.0, February 2016
© 2012 Semtech Corp.
www.semtech.com
76
SX8661Z
Low Power, Capacitive Button Touch and Proximity Controller
(8 sensors) with LED Drivers and Analog Output
6.7
NVM burn
The content of the SPM can be copied permanently (burned) into the NVM to be used as the new default
parameters. The burning of the NVM can be done up to three times and must be done only when the SPM is
completely written with the desired data.
The number of times the NVM has been burned can be monitored by reading NvmCycle from the I2C register
GenStatLsb[7:5].
NVM
SPM
GenstatLsb[7:5]
1
2
3
0
4
QSM
Figure 58
Simplified Diagram NvmCycle
Figure 58 shows the simplified diagram of the NvmCycle counter.
The SX8661Z is delivered with first NVM burned and NvmCycle set to one. The SPM points to the first NVM.
Each NVM burn will increase the NvmCycle. At the fourth NVM burn the SX8661Z switches definitely to the QSM.
The burning of the SPM into the NVM is done by executing a special sequence of four I2C commands.
1. Write the data 0x62 to the I2C register I2CKeyMsb.
Terminate the I2C write by a STOP.
2. Write the data 0x9D to the I2C register I2CKeyLsb.
Terminate the I2C write by a STOP.
3. Write the data 0xA5 to the I2C register I2CSpmBaseAddr.
Terminate the I2C write by a STOP.
4. Write the data 0x5A to the I2C register I2CSpmBaseAddr.
Terminate the I2C write by a STOP.
This is illustrated in Figure 59.
S
SA
0
0x0E
A
0xA5
A
P
A
S
: Start condition
SA
: Slave address
A
: Slave acknowledge
P
: Stop condition
From master to slave
From slave to master
S
SA
0
0x0E
A
0x5A
A
P
A
3)
4)
S
SA
0
0xAC
A
0x62
A
P
A
S
SA
0
0xAD
A
0x9D
A
P
A
1)
2)
Figure 59:
NVM burn procedure



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