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PCF2129AT データシート(PDF) 44 Page - NXP Semiconductors |
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PCF2129AT データシート(HTML) 44 Page - NXP Semiconductors |
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44 / 68 page  PCF2129A_1 © NXP B.V. 2010. All rights reserved. Product data sheet Rev. 01 — 13 January 2010 44 of 68 NXP Semiconductors PCF2129A Integrated RTC, TCXO and quartz crystal 9. Interfaces The PCF2129A has a selectable I2C-bus or SPI-bus interface. The selection is done using the interface selection pin IFS (see Table 47). Table 47. Interface selection input pin IFS Pin Connection Bus interface Reference IFS VSS SPI-bus Section 9.1 BBS I2C-bus Section 9.2 To select the SPI-bus interface, pin IFS has to be connected to pin VSS. To select the I2C-bus interface pin IFS has to be connected to pin BBS. a. SPI-bus interface selection b. I2C-bus interface selection Fig 26. Interface selection 001aaj706 1 VDD BBS SCL CE 20 PCF2129A 2 SDI 19 3 SDO 18 4 SDA/CE 17 5 IFS 16 615 714 8 VSS 13 912 10 11 SDO SDI SCL VDD VSS 001aaj707 1 VDD BBS SCL 20 PCF2129A 2 SDI 19 3 SDO 18 4 SDA/CE 17 5 IFS 16 615 714 8 VSS VSS 13 SDA SCL RPU RPU VDD 912 10 11 |
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