ZC706 Evaluation Board User Guide
55
UG954 (v1.5) September 10, 2015
Feature Descriptions
Real Time Clock (RTC)
The Epson RTC-8564JE (U26) is an I
2
C bus interface real-time clock that has a built-in
32.768 KHz oscillator with these features:
• Frequency output options: 32.768 KHz, 1,024 Hz, 32 Hz or 1 Hz
• Calendar output functions: Year, month, day, weekday, hour, minute and second
• Clock counter, alarm and fixed-cycle timer interrupt functions
• Back-up battery B3 Panasonic ML621S/DN, 3.0V rechargeable cell
Programming information for the RTC-8564JE is available in the
RTC-8564JE/NB Application
Manual
.
shows the real time clock circuit.
Real time clock connections to the XC7Z045 AP SoC and the PCA9548 8-Channel bus switch
are listed in
. Refer to
for the RTC I
2
C address.
Information about the RTC-8564JE is available at the Epson Electronics America website
.
X-Ref Target - Figure 1-23
Figure 1-23:
Real Time Clock Circuit
Table 1-26:
Real Time Clock Connections
RTC-8564JE (U16) Pin
Net Name
Connects To
6
IIC_RTC_SCL
U65.11 (PCA9548 SC4)
7
IIC_RTC_SDA
U65.10 (PCA9548 SD4)
10
IIC_RTC_IRQ_1_B U1.AA17 (XC7Z045 AP SoC PL BANK 10)
UG954_c1_23_041113
VCC3V3
VCC2V5
VADJ
GND
IIC_RTC_SCL
B3
Panasonic
ML621S/DN
3V
C350
0.01
μ
F
25V
X7R
1
J60
YELLOW
IIC_RTC_IRQ_1_B
IIC_RTC_SDA
D5
BAT54T1G
30V 400 mW
RTC-8564JE
Real Time Clock
Module
7
6
10
U26
16
15
14
13
INT
SCL
SDA
GND
CLKOUT
CLKOE
VCC
D4
BAT54T1G
30V 400 mW
D6
BAT54T1G
30V 400 mW
GND
GND
R270
10.0 K
Ω
0.1W
R501
4.7 K
Ω
0.1WW
1
2