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1339-2DCGI Datasheet(PDF) 3 Page - Renesas Technology Corp

Part # 1339-2DCGI
Description  Real-Time Clock with Serial I2C Interface
PDF  28 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

1339-2DCGI Datasheet(HTML) 3 Page - Renesas Technology Corp

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1339 Datasheet
3
©2007-2023 Renesas Electronics Corporation
December 14, 2023
Typical Operating Circuit
Detailed Description
The following sections discuss in detail the Oscillator block,
Power Control block, Clock/Calendar Register, Alarms,
trickle Charger, and Serial I2C block.
Oscillator Block
Selection of the right crystal, correct load capacitance and
careful PCB layout are important for a stable crystal
oscillator. Due to the optimization for the lowest possible
current in the design for these oscillators, losses caused by
parasitic currents can have a significant impact on the
overall oscillator performance. Extra care needs to be taken
to maintain a certain quality and cleanliness of the PCB.
Crystal Selection
The key parameters when selecting a 32kHz crystal to work
with 1339 RTC are:
• Recommended Load Capacitance
• Crystal Effective Series Resistance (ESR)
• Frequency Tolerance
Effective Load Capacitance
Please see diagram below for effective load capacitance
calculation. The effective load capacitance (CL) should
match the recommended load capacitance of the crystal in
order for the crystal to oscillate at its specified parallel
resonant frequency with 0ppm frequency error.
In the above figure, X1 and X2 are the crystal pins of our
device. Cin1 and Cin2 are the internal capacitors which
include the X1 and X2 pin capacitance. Cex1 and Cex2 are
the external capacitors that are needed to tune the crystal
frequency. Ct1 and Ct2 are the PCB trace capacitances
between the crystal and the device pins. CS is the shunt
capacitance of the crystal (as specified in the crystal
manufacturer's datasheet or measured using a network
analyzer).
Note: The 1339CSRI integrates a standard 32.768kHz
(±20ppm) crystal in the package and contributes an
additional frequency error of 10ppm at nominal VCC (+3.3V)
and TA=+25°C.
CPU
X1
X2
VCC
SQW/INT
VBACKUP
GND
SDA
SCL
CRYSTAL
1339
+
-
VCC
RPU
2k
VCC
VCC
10k
RPU
2k
12
6
5
7
3
4
8



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