PCF85263ATT/AJ View Datasheet(PDF) - NXP Semiconductors.
Part Name
Description
MFG CO.
PCF85263ATT/AJ
NXP Semiconductors.
'PCF85263ATT/AJ' PDF : 100 Pages View PDF
NXP Semiconductors
PCF85263A
Tiny RTC with alarm, battery switch-over, and I2C-bus
8.11.3.4
Switching at the lower of VBAT and Vth level, BSM[1:0] = 11
With this mode switching takes place when VDD falls below the lower of Vth or VBAT. In
Figure 27, an example is given where the threshold is set to 1.5 V and a single cell battery
is connected to VBAT. In this example, switching to the battery voltage takes place when
VDD falls below VBAT.
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Fig 27. Switching at the lower of VBAT or Vth
8.11.4 BSTH: threshold voltage control
Table 42. BSTH - battery switch control (address 26h) bit description
Bit
Symbol
Value
Description
0
BSTH
battery switch threshold voltage, Vth
0[1]
Vth = 1.5 V
1
Vth = 2.8 V
[1] Default value.
The threshold for battery switch-over is selectable between two voltages, 1.5 V and 2.8 V.
8.11.5 Battery switch interrupts
The generation of interrupts from the battery switch function is controlled via the battery
switch interrupt enable bits; BSIEA and BSIEB. These bits are in registers INTA_enable
(address 29h) and INTB_enable (address 2Ah).
The assertion of the flag BSF (register Flags, address 2Bh) can be used to generate an
interrupt at pins INTA and INTB. The interrupt may be generated as a pulsed signal or
alternatively as a permanently active signal which follows the condition of bit BSF. BSF
remains set until cleared by command.
PCF85263A
Product data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 4.1 — 27 November 2015
© NXP Semiconductors N.V. 2015. All rights reserved.
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