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PCF8564A 数据表(PDF) 57 Page - NXP Semiconductors |
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PCF8564A 数据表(HTML) 57 Page - NXP Semiconductors |
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57 / 86 page  NXP Semiconductors PCA2131 Nano-power highly accurate RTC with integrated quartz crystal for automotive applications aaa-041583 S 1 0 1 0 to n (data bytes plus ACK) DATA BYTE LAST DATA BYTE read bit acknowledge from PCA2131 0 0 1 1 1 A A S 1 0 1 set register address read register data write bit 0 0 1 1 0 A A P A P no acknowledge acknowledge from master STOP acknowledge from PCA2131 acknowledge from PCA2131 register address 00h to 36h slave address slave address Figure 34. Bus protocol, reading from registers 7.16.3 Bus communication and battery backup operation To save power during battery backup operation (see Section 7.5.1), the bus interfaces are inactive. Therefore the communication via I2C- or SPI-bus should be terminated before the supply of the PCA2131 is switched from VDD to VBAT. With I2C interface, PCA2131 will terminate transaction before switching from VDD to VBAT, with SPI interface, PCA2131 will corrupt SPI write and read data when battery switchover occurs. Remark: If the I2C-bus communication was terminated uncontrolled, the I2C-bus has to be reinitialized by sending a STOP followed by a START after the device switched back from battery backup operation to VDD supply operation. 7.17 Internal circuitry aaa-041584 PCA2131 VDD CLKOUT SDA/CE VSS SDI SCL SDO VBAT INTA/B TS1/2/3/4 BBS IFS Figure 35. Device diode protection diagram of PCA2131 PCA2131 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved. Product data sheet Rev. 1.0 — 26 July 2021 57 / 86 |
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