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Introduction
The uM-PWM1 chip is designed to work with pulse-width modulated signals used for remote control servo applications. It provides up to 8 input channels for monitoring pulse widths and 8 output channels for producing pulse width modulated (PWM) signals at either 50 Hz or a selectable frequency from 10 to 450 Hz. It can be interfaced with a microcontroller using an I2C or serial data interface.
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Features
- internal oscillator
- I2C bus interface (up to 400 Kbps)
- serial data interface
- up to 8 input channels
- pulse widths measured with ± 1 microsecond accuracy
- pulse count
- high time
- low time
- frequency
- provides decoding of Pulse Position Modulation (PPM) input signal
- 8 output channels
- pulse widths generated with ± 1 microsecond accuracy
- selectable output channel frequency
- standard frequency (50 Hz)
- alternate frequency (from 10 to 450 Hz)
- pulse widths restricted to specified range
- 800 to 2200 microseconds standard pulse widths
- 500 to 2500 extended pulse widths
- output channel movements can be coordinated and synchronized
- speed and time of output channel movements can be controlled
provides encoding of Pulse Position Modulation (PPM) output signal
5V operating voltage
RoHS compliant
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Applications
- remote control servos
- controlling radio-control models
- UAV
- robotics
- automation
- special effects
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Pin Diagram and Pin Descriptions |
PDIP-28, SOIC-28  |
| Pin |
Name |
Type |
Description |
| 1 |
/MCLR |
Input |
Master Clear (Reset) |
| 2 |
IN0 |
Input |
Input Channel 0 |
| 3 |
IN1 |
Input |
Input Channel 1 |
| 4 |
IN2 |
Input |
Input Channel 2 |
| 5 |
IN3 |
Input |
Input Channel 3 |
| 6 |
IN4 |
Input |
Input Channel 4 |
| 7 |
IN5
PPMIN |
Input |
Input Channel 5
PPM Input |
| 8 |
VSS |
Power |
Digital Ground |
| 9 |
N/C |
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No connection |
| 10 |
N/C |
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No connection |
| 11 |
IN6
TX |
Input
Output |
Input Channel 6
Serial Output |
| 12 |
IN7
RX |
Input |
Input Channel 7
Serial Input |
| 13 |
VDD |
Power |
Digital Supply Voltage |
| 14 |
SEL |
Input |
+5V RX/TX enabled
0v IN6/IN7 enabled |
| 15 |
OUT7
PPMOUT |
Output |
Output Channel 7
PPM Output |
| 16 |
OUT6 |
Output |
Output Channel 6 |
| 17 |
SCL |
Input |
I2C Clock |
| 18 |
SDA |
In/Out |
I2C Data |
| 19 |
VSS |
Power |
Digital Ground |
| 20 |
VDD |
Power |
Digital Supply Voltage |
| 21 |
OUT5 |
Output |
Output Channel 5 |
| 22 |
OUT4 |
Output |
Output Channel 4 |
| 23 |
OUT3 |
Output |
Output Channel 3 |
| 24 |
OUT2 |
Output |
Output Channel 2 |
| 25 |
OUT1 |
Output |
Output Channel 1 |
| 26 |
OUT0 |
Output |
Output Channel 0 |
| 27 |
AVSS |
Power |
Analog Ground |
| 28 |
AVDD |
Power |
Analog Supply Voltage |
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Documentation |
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