M63155FP Renesas Electronics Corporation., M63155FP Datasheet - Page 15

• Manufacturer Part Number: M63155FP
• Description: 3 Phase Brushless Motor Controller
• Manufacturer: Renesas Electronics Corporation.

M63155FP
Function Explanation
5. Oscillator (OSC1, OSC2, SGND)
Rev.1.0, Sep.16.2003, page 15 of 40
The oscillation frequency (Fosc) of the oscillator is determined by the external capacitor and resistor which are
connected to these terminals. The capacitor is connected between OSC2 and SGND, and the resistor is connected
between OSC1 and OSC2.
SGND is the common terminal of the oscillator circuit. So it is connected to the root of the board GND due to
getting the high accurate performance. The oscillation frequency theoretical value is given by:
However, the actual oscillation frequency is different by influence of response of the oscillator circuit.
The characteristic of the theoretical oscillation Frequency – the actual oscillation frequency is as follows (Fig.4).
Fig.4 The characteristic of oscillation frequency (Cosc=180pF)
Fosc [kHz]
1600
1400
1200
1000
800
600
400
200
0
1
(Fosc)
Rosc : External resistance for oscillator
Cosc : External condenser for oscillator
-
2
1
Rosc
TBD
Rosc [kohm]
Cosc
0
1
ln(
1
theoretical value
measurment value
2
)
100