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Jupiter Instruments
_____________________________________________________________________________________
JI-300
26
9/9/07
21.
APPENDIX A
1.0 Specifications
Hardware
PC Interface
Type:
USB 2.0
Connector:
Standard Type B Socket
Power
USB port:
5V @ 300mA (max) Note that all power is
supplied by the USB port.
I2C Interface
Connector:
Standard 9-Pin, D-sub, Female
Pin-outs:
Pin 1 = SDA
Pin 4, 5 = GND
Pin 6 = SCL
Pin 8 = Vbus
Pin 2, 3, 7, 9 = No Connection
SCL/SDA Bus Voltage
(V
bus)
Range:
Programmable - 1.50V to 5.25V (10mV steps) +/-2%
Input Threshold:
V
IL:
0.2V
bus
(typical)
V
IH:
0.7V
bus
(typical)
V
TH:
0.1V
bus
(typical)
Input Voltage Range:
-0.3V to 6.0V (operational)
-5.0V to 10.0V (maximum rating)
SCL Frequency:
Programmable –
Standard: 7.0KHz to 4.0MHz
Advanced: 254Hz to 4.0MHz (20nS steps)
SCL/SDA Sink Current:
27mA
(typical) s
hort–circuit protected
SCL/SDA Pull-up
Resistors:
Programmable – 273 to 4.99K ohms & Open (16
selections) +/-3%
Input Capacitance:
< 40pF without test cables
External Bus Voltage:
Switched V
bus
available to power external I2C
target. Current limited to 90mA
(typical)