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PCF85263ATL/A Datasheet(PDF) 44 Page - NXP Semiconductors |
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PCF85263ATL/A Datasheet(HTML) 44 Page - NXP Semiconductors |
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44 / 100 page  PCF85263A All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved. Product data sheet Rev. 4.1 — 27 November 2015 44 of 100 NXP Semiconductors PCF85263A Tiny RTC with alarm, battery switch-over, and I2C-bus 8.11 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 8.14 on page 57). 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 24 and Figure 25. 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. 8.11.1 BSOFF: battery switch on/off control [1] Default value. The battery switch circuit may be disabled when not used. This disables all the circuit and save power consumption. When disabled connect VBAT and VDD together. Table 36. IO pin behavior in battery mode 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 37. Battery_switch - battery switch control (address 26h) bit description Bit 7 6 5 4 3 2 1 0 Symbol - - - BSOFF BSRR BSM[1:0] BSTH Section -- - Section 8.11.1 Section 8.11.2 Section 8.11.3 Section 8.11.4 Table 38. BSOFF bit - battery switch control (address 26h) bit description Bit Symbol Value Description 4 BSOFF battery switch on/off 0[1] enable battery switch feature 1 disable battery switch feature |
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