an44066a Panasonic Corporation of North America, an44066a Datasheet - Page 26

• Manufacturer Part Number: an44066a
• Description: Driver Ic For Stepping Motor
• Manufacturer: Panasonic Corporation of North America

AN44066A
12. PWMSW, PHA1, PHB1 pins
Usage Notes (continued)
Under conditions where VM power supply is shutdown in standby mode (STBY pin = High level), when applying approx. 0.7 V
(TYP) or more to PWMSW (Pin 24), PHA1 (Pin 25), PHB1 (Pin 26), the current flows into above-mentioned pins owing to
parasitic elements in the LSI and the current flowing into the above-mentioned pins varies from the current determined by pull
down resistance. In addition, the current flowing into PHA1/PHA2 is 341.4 μA (impedance = approx. 9.1 kΩ) at 3.3 V, while that
into PWMSW is 323.2 μA (impedance = approx. 9.7 kΩ) at 3.3 V. There is no problem that the voltage up to rating is applied to
the above-mentioned pins. However, it is recommended to set the voltage applied to the above-mentioned to 0.7 V or less at
shutdown of VM power supply in standby mode.
Also, in case of the voltage of above-mentioned pins > S5VOUT(Pin 21) – 0.2 V at power on to VM power supply, the current
flows owing to parasitic elements in the LSI, and the current flowing into the above-mentioned pins varies (refer to Fig. 2, 3).
As the same as at standby, there is no problem that the voltage up to rating is applied to the above-mentioned pins. However, it is
recommended to set the voltage applied to the above-mentioned pins to 4.3 V or less.
Fig. 2 Input impedance of PHA1/PHB1 at VM power supply power on
Fig. 3 Input impedance of PWMSW at VM power supply power on
400
350
300
250
200
150
100
400
300
200
100
50
0
0
0
0
1
1
PHA1/PHB1 voltage [V]
PWMSW voltage [V]
2
2
Z = 200 kΩ
PWMSW電圧[V]
Z = 200 kΩ
_____
3
3
4
PHA1/PHB1=4.3V
4
PWMSW=4.3V
5
5
S5VOUT = 4.5 V
S5VOUT = 4.5 V
S5VOUT = 5.5 V
6
S5VOUT = 5.0 V
S5VOUT = 5.0 V
S5VOUT = 5.5 V
6
SDL00014AEB
Z = 約4.7 kΩ
Z ≅ 4.7 kΩ
Z = 約4.7 kΩ
Z ≅ 4.7 kΩ
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