MC33164 Просмотр технического описания (PDF) - Motorola => Freescale
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MC33164 Datasheet PDF : 8 Pages
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MC34164 MC33164
Figure 14. Low Voltage Microprocessor Reset With Additional Hysteresis
(MC3X164–5 Shown)
Power
Supply
RH
Iin
2 (2) Vin
1.2 Vref
MC3X164–5 3 (4)
RL
1 (1)
Reset
Microprocessor
Circuit
VH ≈
4.3 RH
RL
+ 0.06
∆Vth(lower) ≈ 10 RH x 10 – 6
where: RH ≤ 1.0 kΩ
43 kΩ ≥ RL ≥ 4.3 kΩ
VH
(mV)
60
103
123
160
155
199
280
262
306
357
421
530
Test Data
∆Vth
RH
(mV) (Ω)
0
0
1.0
100
1.0
100
1.0
100
2.2
220
2.2
220
2.2
220
4.7
470
4.7
470
4.7
470
4.7
470
4.7
470
RL
(kΩ)
43
10
6.8
4.3
10
6.8
4.3
10
8.2
6.8
5.6
4.3
Comparator hysteresis can be increased with the addition of resistor RH. The hysteresis equation has been simplified and does not account for the change of input current
Iin as Vin crosses the comparator threshold (Figure 8). An increase of the lower threshold ∆Vth(lower) will be observed due to Iin which is typically 10 µA at 4.3 V. The
equations are accurate to ±10% with RH less than 1.0 kΩ and RL between 4.3 kΩ and 43 kΩ.
Power
Supply
Figure 15. Voltage Monitor
1.0 k
2 (2)
1 (1)
1.2 Vref
3 (4)
Figure 16. Solar Powered Battery Charger
2 (2)
1 (1)
Solar
Cells
1.2 Vref
3 (4)
Figure 17. MOSFET Low Voltage Gate Drive Protection Using the MC3X164–5
VCC
RL
270
MTP3055EL
4.3V
2 (2)
1.2 Vref
1 (1)
Overheating of the logic level power MOSFET due to insufficient
gate voltage can be prevented with the above circuit. When the
input signal is below the 4.3 V threshold of the MC3X164–5, its
output grounds the gate of the L2 MOSFET.
3 (4) MC3X164–5
6
MOTOROLA ANALOG IC DEVICE DATA
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