PCF2129AT/1,518 NXP Semiconductors, PCF2129AT/1,518 Datasheet - Page 17

• Manufacturer Part Number: PCF2129AT/1,518
• Description: IC RTC /CALENDAR TCXO QTZ 20SOIC
• Manufacturer: NXP Semiconductors
• Type: Clock/Calendar/Alarmr

Specifications of PCF2129AT/1,518

• Package / Case: 20-SOIC (7.5mm Width)
• Time Format: HH:MM:SS (12/24 hr)
• Date Format: YY-MM-DD-dd
• Interface: I²C, SPI
• Voltage - Supply: 1.8 V ~ 4.2 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Function: Clock/Calendar
• Supply Voltage (max): 4.2 V
• Supply Voltage (min): 1.8 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Rtc Bus Interface: Serial (3-Wire, I2C, SPI)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 935288599518

NXP Semiconductors
PCF2129A_2
Product data sheet
8.5.1.3 Battery switch-over disabled: only one power supply (V
8.5.1.4 Battery switch-over architecture
The direct switching mode is useful in systems where V
The direct switching mode is not recommended if the V
(e.g. V
reduced compared to the standard mode because the monitoring of V
not performed.
When the battery switch-over function is disabled:
The architecture of the battery switch-over circuit is shown in
Fig 5.
•
•
•
•
V
DD
V
The power supply is applied on the V
The V
The internal power supply, available at the output pin BBS, is equal to V
The battery flag (BF) is always logic 0
(= 2.5 V)
th(sw)bat
(= 0 V)
DD
V
V
INT
BAT
BF
DD
Battery switch-over behavior in direct switching mode with bit BIE set logic 1
(enabled)
= 3.3 V, V
BAT
backup battery operation
pin must be connected to ground
All information provided in this document is subject to legal disclaimers.
V
BAT
BBS
≥ 3.0 V). In direct switching mode the power consumption is
Rev. 02 — 7 May 2010
internal power supply (= V
DD
pin
Integrated RTC, TCXO and quartz crystal
DD
DD
BBS
is higher than V
and V
DD
)
Figure
)
BAT
PCF2129A
values are similar
6.
DD
cleared via interface
© NXP B.V. 2010. All rights reserved.
and V
BAT
DD
at all times.
th(sw)bat
001aaj312
V
17 of 69
BBS
is