Proxim RangeLAN2 7920 Manuel d'utilisateur télécharger pdf (Page 36)

(1) CRRfT

)2(693.0/1 +==

The frequency (f) is given by:

(2)

For the pulse width modulation part of the circuit R=100 kΩ, C=0.047 uF V

=6V and

Vin is determined by the output from the BL2000 digital to analog converters. The

positive pulse width is given by:

(3) RCVVT

ccin

)/1ln( −−=

Calculated Left PWM Right PWM

Frequency 120.25 Hz 118Hz 118Hz

Stop Vin 1.5V 1.56V 1.56V

Stop Pulse Width 1.421msec 1.41msec 1.41msec

Reverse Vin 1.0V 1.04V 1.04V

Rev Pulse Width 0.898msec 0.920msec 0.920msec

Forward Vin 2.0V 2.05V 2.05V

Fwd Pulse Width 2.009msec 2.05msec 2.05msec

Table 3. PWM Specifications

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 102 103

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Proxim RangeLAN2 7920 Manuel d'utilisateur Page 36