Eddy DK Programmer Guide
57
2.5.6
RTC
- We used D1340 which is connected I2C interface.
- In DS1340, you must use crystal of load capacitance = 12.5pF (Refer to bellow Crystal spec)
- You have to confirm Crystal spec because some RTC Chips have different spec
- We used CR2032 (235mAh) Lithium with Backup Battery
DS1340 Crystal Specifications
Parameter
Symbol
MIN
TYP
MAX
Units
Normal Frequency
fo
32.768
KHz
Series Resistance
ESR
45,60
KΩ
Load Capacitance
CL
12.5
pF
2.5.7
Temp Sensor
we used LM50(National) to AD0(PC0)
