Digi JACKRABBIT BL1800 User Manual download pdf (Page 21)

User’s Manual 17

3.2 Digital Inputs/Outputs

3.2.1 Digital Inputs

The Jackrabbit has six CMOS-level digital inputs, PB0–PB5, each of which is pulled up to

+5 V as shown in Figure 5. The BL1820, which does not have RS-485, has one additional

CMOS-level digital input, PC1.

Figure 5. Digital Inputs

The actual switching threshold is approximately 2.40 V. Anything below this value is a

logic 0, and anything above is a logic 1.

NOTE: Since the voltage limits on the inputs to the Rabbit 2000 microprocessor are 0 to

5.5 V DC, the end user must ensure that the voltage applied to any I/O pin is within

these limits.

47 kW

Rabbit 2000



Microprocessor

Vcc

GND

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 83 84

Jackrabbit (BL1800) 1
Z-World, Inc 2
Trademarks 2
TABLE OF CONTENTS 3
1. INTRODUCTION 5
Table 1. Jackrabbit Features 6
1.3 How to Use This Manual 7
1.4 CE Compliance 8
User’s Manual 5 9
6 Jackrabbit (BL1800) 10
2. HARDWARE SETUP 11
8 Jackrabbit (BL1800) 12
Prototyping 13
Jackrabbit 13
PC COM port 14
User’s Manual 11 15
2.3 Run a Sample Program 16
2.4 Where Do I Go From Here? 17
14 Jackrabbit (BL1800) 18
3. SUBSYSTEMS 19
3.1 Jackrabbit Pinouts 20
3.2 Digital Inputs/Outputs 21
HV0HV2 SINKING OUTPUTS 22
HV3 SOURCING OUTPUT 22
User’s Manual 19 23
20 Jackrabbit (BL1800) 24
3.3 A/D Converter 25
22 Jackrabbit (BL1800) 26
3.4 D/A Converters 27
2.5 V 1 e 28
–× 17.4 mV= 28
User’s Manual 25 29
26 Jackrabbit (BL1800) 30
User’s Manual 27 31
3.5 Serial Communication 32
Ground recommended 33
30 Jackrabbit (BL1800) 34
3.6 Memory 35
3.7 Other Hardware 36
34 Jackrabbit (BL1800) 38
4. SOFTWARE REFERENCE 39
36 Jackrabbit (BL1800) 40
4.2 Sample Programs 41
Top Side 42
User’s Manual 39 43
must be called first 44
4.3.1.4 Analog Input 45
42 Jackrabbit (BL1800) 46
4.4 Upgrading Dynamic C 47
44 Jackrabbit (BL1800) 48
APPENDIX A. SPECIFICATIONS 49
Exclusion 52
User’s Manual 49 53
A.2 Jumper Configurations 54
User’s Manual 51 55
Conformally coated area 56
JACKRABBIT 57
54 Jackrabbit (BL1800) 58
User’s Manual 55 59
56 Jackrabbit (BL1800) 60
PPENDIX B. PROTOTYPING BOARD 61
58 Jackrabbit (BL1800) 62
User’s Manual 59 63
Bottom Side 64
(not included 65
Thermistor 67
Potentiometer 67
User’s Manual 65 69
66 Jackrabbit (BL1800) 70
APPENDIX C. POWER MANAGEMENT 71
Regulated 72
Undervoltage dropout area 72
Current (mA) 73
DCIN (V) 73
70 Jackrabbit (BL1800) 74
User’s Manual 71 75
Figure C-6. VRAM Switch 76
C.3 Chip Select Circuit 77
74 Jackrabbit (BL1800) 78
NOTICE TO USERS 79
76 Jackrabbit (BL1800) 80
User’s Manual 77 81
78 Jackrabbit (BL1800) 82
SCHEMATICS 83

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