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PCF85363ATL/AX 数据表(PDF) 39 Page - NXP Semiconductors |
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PCF85363ATL/AX 数据表(HTML) 39 Page - NXP Semiconductors |
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39 / 86 page  NXP Semiconductors PCF85363A Tiny Real-Time Clock/calendar with 64 byte RAM, alarm function, battery switch-over time stamp input, and I2C-bus The PCF85363A is designed to operate with quartz with CL values of 6.0 pF, 7.0 pF and 12.5 pF. 12.5 pF are generally the cheapest and most widely available, but also require the most power to drive. The circuit also operates with 9.0 pF quartz, however the offset calibration would be needed to compensate. If a 9.0 pF quartz is used, then it is recommended to set CL to 7.0 pF. 7.11 Battery switch register This register configures the battery switch-over mode. Associated with the battery switch-over is the battery switch flag (BSF) in the Flags register (Section 7.14). Whenever the IC switches to battery operation, the flag is set. The flag can only be read when operating from VDD power, however an interrupt pulse or static LOW signal can be generated whenever switching to battery. An interrupt pulse can also be generated when switching back to VDD power. Examples are given in Figure 23 and Figure 24. When switched to battery, the VDD power domain is disabled. This means that I2C pins are ignored, CLK output is disabled and Hi-Z, TS pin output mode is disabled and Hi-Z, TS digital input is ignored and may be left floating. TS pin mechanical switch detector is active. INTA output is still active for interrupt output and battery switch indication, but disabled for clock output. IO pin (mode) VDD operation VBAT operation SCL active input disabled; may be left floating SDA active input/output disabled; may be left floating CLK active output disabled; Hi-Z TS (output mode) active output disabled; Hi-Z TS (digital input) active input disabled; may be left floating TS (mechanical switch input) active input active input INTA active output active interrupt output Table 35. IO pin behavior in battery mode Bit 7 6 5 4 3 2 1 0 Symbol - - - BSOFF BSRR BSM[1:0] BSTH Section - - - Section 7.11.1 Section 7.11.2 Section 7.11.3 Section 7.11.4 Table 36. Battery_switch - battery switch control (address 26h) bit description 7.11.1 BSOFF: battery switch on/off control Bit Symbol Value Description battery switch on/off 0[1] enable battery switch feature 4 BSOFF 1 disable battery switch feature Table 37. BSOFF bit - battery switch control (address 26h) bit description PCF85363A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2021. All rights reserved. Product data sheet Rev. 3.1 — 18 June 2021 39 / 86 |
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