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| 型号： | 101-0581 |
| 厂商： | Rabbit Semiconductor |
| 文件页数： | 31/106页 |
| 文件大小： | 0K |
| 描述： | KIT CONNECTION FOR BL2500 SERIES |
| 标准包装： | 1 |
| 系列： | RabbitNet™ |
| 附件类型： | RabbitNet 连接套件 |
| 适用于相关产品： | BL2500 |
| 其它名称： | 101-581 101-581-ND |
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Coyote (BL2500)
PB2 can be imagined to be a “DA0 voltage is too low” indicator. If DA0 is smaller than
the analog voltage presented at AD0, then PB2 will be true (high). If this happens, the pro-
gram will need to raise the DA0 voltage.
The A/D converter has no reference voltage. There is a relative accuracy between mea-
surements, but no absolute accuracy without calibration. This is because the +3.3 V supply
can vary ±5%, the pulse-width modulated outputs might not reach the full 0 V and 3.3 V
rails out of the Rabbit 3000 microprocessor, and the gain resistors used in the circuit have
a 1% tolerance. For these reasons, each Coyote needs to be calibrated individually, with
the constants held in software, to be able to rely on an absolute accuracy. The Coyote has
this calibration support.
An A/D conversion takes less than 100 ms with a 29.4 MHz Coyote.
3.4.2 D/A Converters
Two D/A converter outputs, DA0 and DA1, are supplied on the Coyote. These are shown
in Figure 14.
Figure 14. Schematic Diagram of D/A Converters
The D/A converters have no reference voltage. Although they may be fairly accurate from
one programmed voltage to the next, they do not have absolute accuracy. This is because
the +3.3 V supply can change ±5%, the PWM outputs might not achieve the full 0 V and 3.3 V
rail out of the processor, and the gain resistors in the circuit have a 1% tolerance. The D/A
converters therefore need individual calibration, with the calibration constants held in
software before absolute accuracy can be relied on. The Coyote has such calibration.
Note that DA0 is used to provide a reference voltage for the A/D converter and is unavail-
able for D/A conversion when the A/D converter is being used.
+
LM324
PF6
9
10
8
R6
24.9 kW
DA0
R4
1.0 kW
R12
10 kW
C2
100 nF
R7
24.9 kW
+
LM324
PF7
DA1
1.0 kW
100 nF
R10
24.9 kW
C5
R15
R13
24.9 kW
12
13
14
10 kW
R9
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