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參數(shù)資料
| 型號(hào)： | RS5C372B-E2 |
| 廠商： | RICOH COMPANY LTD |
| 元件分類： | XO, clock |
| 英文描述： | I2C-bus Serial Interface Real Time Clock (8pin SSOP) |
| 中文描述： | REAL TIME CLOCK, PDSO8 |
| 封裝： | 0.65 MM PITCH, SSOP-8 |
| 文件頁數(shù)： | 23/39頁 |
| 文件大小： | 474K |
| 代理商： | RS5C372B-E2 |
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RS5C372B
- 23 -
2.
Configuration of Oscillating Circuit and Time Trimming
2.1. Configuration of Oscillating Circuit
OSCIN
OSCOUT
A
VDD
VDD
32kHz
RD
RF
CG
CD
The oscillation circuit is driven at a constant voltage of about 1.2V relative to the Vss level.
Consequently, it generates a wave form having a peak-to-peak amplitude of about 1.2V on the positive side
of the Vss level.
Considerations on crystal oscillator
Basic characteristics of a crystal oscillator includes R1 (equivalent series resistance: ease of oscillation) and
CL (load capacitance: rank of center frequency). R1=typ. of 30k
, CL=6 to 8pF is recommended for the
RS5C372B. Confirm recommended values to the manufacturer of the crystal oscillator used.
Considerations in Mounting Components Surrounding Oscillating Circuit
1) Mount the crystal oscillators in the closest possible position to the IC.
2) Avoid laying any signal or power line close to the oscillation circuit (particularly in the area marked with
←
A
→
in the above figure).
3) Apply the highest possible insulation resistance between the OSCIN or OSCOUT pin and the PCB.
4) Avoid using any long parallel line to wire the OSCIN or OSCOUT pin.
5) Take extreme care not to cause condensation, which leads to various problems such as oscillation
halt.
Other Relevant Considerations
1) When applying an external input of clock pulses (32.768kHz or 32.000kHz) to the OSCIN pin:
DC coupling: Prohibited due to mismatching of input levels.
AC coupling: Permissible except that unpredictable results may occur in oscillator halt sensing due
o possible sensing errors caused by noises, etc.
2) Avoid using the oscillator output of the RS5C372B (from the OSCOUT pin) to drive any other IC for
he purpose of ensuring stable oscillation.
2.2. Measurement of oscillation frequency
frequency
counter
VDD
OSCIN
OSCOUT
32KOUT
VSS
32768Hz or
32000Hz
Typical external devices
X’tal : 32.768kHz or
32.000KHz
(R1=30k
typ)
(CL=6pF to 8pF)
Typical value of internal devices
RF 15M
typ
RD 60k
typ
CG,CD 10pF typ
*1) Clock pulse of 32.768kHz or 32.000kHz is output
from the 32KOUT output pin on powering on (XSTP
is set to 1).
*2) Use a frequency counter having at least 6 digits
(7 digits or more recommended).
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