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SX8661 bảng dữ liệu(PDF) 78 Page - Semtech Corporation

tên linh kiện SX8661
Giải thích chi tiết về linh kiện  Low Power, Capacitive Button Touch and Proximity Controller
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nhà sản xuất  SEMTECH [Semtech Corporation]
Trang chủ  http://www.semtech.com
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SX8661 bảng dữ liệu(HTML) 78 Page - Semtech Corporation

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ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Revision v3.2, January 2011
© 2011 Semtech Corp.
www.semtech.com
78
SX8661
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].
Figure 60
Simplified Diagram NvmCycle
Figure 60 shows the simplified diagram of the NvmCycle counter. The SX8661 is delivered with empty NVM and
NvmCycle set to zero. The SPM points to the QSM.
Each NVM burn will increase the NvmCycle. At the fourth NVM burn the SX8661 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 61.
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 61:
NVM burn procedure



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