ZIO, Motherboard User Manual
Rev. 2.0
Zilogic Systems
Page 6
Table 2.4.
PWM
Header
Pin #
Signal Name
1
VCC
2
PWM 0
3
PWM 1
4
PWM 2
5
PWM 3
6
PWM 4
7
PWM 5
8
Freq-In 0
9
Freq-In 1
10
GND
VCC
(Pin 1)
This is the +5V power supply for the external add-on boards. The
supply has a total current limit of 200mA when powered through
USB.
PWM
(Pin 2 - 7)
These are PWM output signals. The PWM signal when active
produces a stream of pulses whose width can be controlled
through software. An important parameter of a PWM signal is the
duty cycle
. The duty cycle is defined as the ratio between the
pulse duration and pulse period of a rectangular waveform.
The PWM signal can be used to control the power delivered to
a load, by controlling the duty cycle of the PWM signal. PWM
signals are generally used for Motor speed control, LED brightness
control, power supplies and wave form generation.
The PWM signal is a 5V CMOS/TTL output.
Freq-In
(Pin 8, 9)
These are input signals, used for event counting and frequency
measurement. These signals are 5V tolerant CMOS/TTL inputs.
5.
AIO
Pinmap
The
AIO
header is terminated with 6 ADC channels, 1 DAC and power supply. Sensors can be
connected to this header.
Table 2.5.
AIO
Header
Pin #
Signal Name
1
VCC
2
ADC 0
3
ADC 1
