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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SX8663 датащи(PDF) 60 Page - Semtech Corporation |
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SX8663 датащи(HTML) 60 Page - Semtech Corporation |
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60 / 64 page  ADVANCED COMMUNICATIONS & SENSING Rev5 4 th August 2011 © 2011 Semtech Corp. www.semtech.com 60 SX8663 Capacitive Button Matrix (up to 36) and Proximity Controller with Individual LED Drivers and Buzzer 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 53 Simplified Diagram NvmCycle Figure 53 shows the simplified diagram of the NvmCycle counter. The SX8663 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 SX8663 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 54. 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 54: NVM burn procedure |
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