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Preliminary
(R)
* Application Interface Module for the DM1800 Transceiver Modules * USB Host Computer Interface with Virtual Serial Port Driver * Choice of USB or External DC Power Sources * Supports Analog and Logic Inputs and a Logic Output
The IM1800 is designed as an application interface module for the DM1800 series transceivers. The IM1800 can be powered from either its USB interface or from an external DC power input. The IM1800 USB interface is supported by a host computer virtual serial port driver. In addition, the IM1800 provides terminal block connections for an analog input, a logic input and a logic output. Direct connections to the DM1800 transceiver module USART are also provided on the IM1800 terminal block.
IM1800
Transceiver Interface Module
Absolute Maximum Ratings Rating VIN All Other Input/Output Connections Non-Operating Ambient Temperature Range Electrical Characteristics Characteristic Digital Output Source Current Digital Output Sink Current Virtual Serial Port Data Rate Power Supply Input Voltage Range, -40 to +85 C Power Supply Input Voltage Range, 0 to +85 C Regulated Power Supply Output Voltage, VIN 3.1 to 14 V Current Available for External Circuitry
o o
Value -0.3 to +16.0 -0.3 to +4.0 -50 to +100
Units V V
o
C
Sym
Notes
Minimum
Typical 0.5 1 9.6
Maximum
Units mA mA kb/s
VIN VIN VOUT
3.1 2.6 3.0
14 14
V V Vdc
10
mA
1
IM1800 Applications The IM1800 is a companion interface board for the DM1800 series transceiver modules. It has two uses: First, the IM1800 can be used as a general purpose interface for DM1800 series transceiver modules. For this application, the IM1800 provides a captured screw I/O terminal block, a virtual serial port USB interface, and a choice of USB, coaxial plug or terminal block for the DC power supply input. For DM1800 base stations and field nodes, the IM1800 supports serial communications through the virtual serial port USB interface, or by direct connection to the USART on the DM1800 module.
serial interface should remain unconnected. The IM1800 virtual serial port USB interface is based on the Silicon Labs CP2101 IC. The CP2101 drivers can be downloaded from www.silabs.com. After the correct driver has been installed on a host PC, the USB interface will appear as a serial port. Bread Boarding Area
Referring to Figure 1, the IM1800 bread boarding area is supplied with ground connections on eyelet Row 10 (vertical row of eyelets on right side), VOUT on eyelet Row 3, and VIN on eyelet Row 2. VOUT and the I/O signals from the DM1800 are also provided in two locations on Row 1. Refer to the table on Pages 3 and 4 for Second, the IM1800 can be used as a development details. Note that the DM1800 can provide up to 10 mA platform for applications where a DM1800 series trans- for supplying external circuitry. Additional power can be ceiver will be installed a customer's board. In addition to provided by adding a 3 V regulator in the bread boardthe features listed above, the IM1800 provides a coning area and running it from VIN. Take caution not to nector strip for jumpering a flat cable to a customer's operate circuitry from VIN that directly interfaces the board (or for a logic analyzer/oscilloscope connection), DM1800 I/O signals to avoid damaging the DM1800 and a "bread board" area for building and testing interand/or IM1800. Note that any components placed on face circuits. the bread boarding area directly under where the DM1800 module plugs in must be no taller than 0.1 Power Supply Options inch. The IM1800 will accepts an external DC power supply voltage in the range of 2.6 to 14 V (3.1 to 14 V for extended temperature operation). This voltage is routed to the 3 Vdc regulator on the DM1800 transceiver (see description of J2-3 on Page 3 for VOUT characteristics). The external power supply voltage can be connected to VIN on terminal block J2 or to the coaxial power connector J6. The IM1800 can also be powered from the USB connector J1. When the IM1800 is powered from the USB connector, no connection should be made to the VIN terminal on terminal block J2 or to the coaxial power connector J6. Serial Port Options The IM1800 provides direct connections to the DM1800 transceiver module USART on terminal block J2. Note that the DM1800 USART I/O is 3 V CMOS logic. Alternately, the serial port on a DM1800 can be interfaced through the serial port-USB bridge IC on the IM1800. Only one interface should be used at a time; the other I/O and Power Supply Precautions Note that all analog and digital input signals must be within the range of 0 to VOUT. Applying a signal outside of this range may damage the DM1800 and/or IM1800. External DC power supplies must be in the range of 2.6 to 14 V. Suitable external power supplies include batteries and transformer isolated, regulated DC power supplies. Be cautious when using unregulated "wall transformer" DC supplies. The output voltage of these unregulated supplies can be much higher than the nameplate value when powering low current loads. Note: the IM1800 is equipped with a programming connector compatible with a Microchip MPLAB(R) ICD 2. Except in special circumstances, however, all DM1800 transceiver modules are shipped pre-programmed. Reprogramming a pre-programmed DM1800 transceiver module will void the warranty and any regulatory certifications of the module.
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Connector and Terminal Block Descriptions
Pin J1-1 J1-2 J1-3 J1-4 J1-5 J1-6 J2-1 J3-1 J4-1 J2-2 J3-2 J4-2 J2-3 J3-3 J4-3 R1-7 R1-28 J2-4 J3-4 J4-4 R1-6 R1-27 J2-5 J3-5 J4-5 R1-5 R1-26 J2-6 J3-6 J4-6 R1-4 R1-25 J2-7 J3-7 J4-7 R1-3 R1-24 J2-8 J3-8 J4-8 R1-2 R1-23 J2-9 J3-9 J4-9 R1-1 R1-22 J2-10 J3-10 J4-10 J5-1 Name VBUS DD+ GND GND GND GND Description This is the USB VBUS. The IM1800 and its DM1800 transceiver module can be powered from this supply. This is the USB D- signal. This is the USB D+ signal. This is a signal and power supply ground for the USB connector. This is a signal and power supply ground for the USB connector. This is a signal and power supply ground for the USB connector. This is a signal and power supply ground.
VIN
This is the power supply positive input. The allowed input voltage range is 2.6 to 14 V.
VOUT
VOUT tracks 50 to 100 mV below VIN when VIN is in the range of 2.6 to 3.1 V. When VIN is in the range of 3.1 to 14 V, VOUT is regulated at 3.0 Vdc. Up to 10 mA can be supplied for powering external circuits such as thermistor-resistor networks. External circuitry must not impress more than 10 mVp-p ripple on the regulated output voltage.
BIND
This is connected to a logic input on the microcontroller, and is configured with a weak pull-up. When this pin is momentarily grounded (to J1-1 or J1-10, the module is placed into the bind mode, allowing this module to be associated with other modules to form a network.
DIGITAL IN
This is connected to a logic input on the microcontroller, and is configured with a weak pull-up, allowing both logic signals and contact closures referenced to J-1 or J-10 to be read. The value of this input is sent over the RF channel as a response to an RF command. The input voltage range on this pad is 0 to VOUT. Applying a voltage outside of this range may damage the module.
ANALOG IN
This is connected to the input to the microcontroller's 10-bit analog-to-digital (ADC) converter. The ADC input range is 0 to VOUT, and the input voltage range on this pad is 0 to VOUT. Applying a voltage outside of this range may damage the module. The reading is sent over the RF channel as a response to an RF command.
DIGITAL OUT
This is connected to a logic output on the microcontroller through a 1 kilohm resistor, which provides shortcircuit protection. The value of this output is set or read over the RF channel as a response to an RF command.
SERIAL RX
This is connected to the module's serial data input (USART). Data to this input is received at 9.6 kb/s, using 8 data bits, no parity, and one stop bit. The input voltage range on this pad is 0 to VOUT. Applying a voltage outside of this range may damage the module.
SERIAL TX
This is the connected to the module's serial data output (USART) through a 1 kilohm resistor, which provides short-circuit protection. Data from this output is sent at 9.6 kb/s, using 8 data bits, no parity, and one stop bit.
GND Vpp/~MCLR
This is a signal and power supply ground. This is the programming connector microcontroller reset and programming voltage pulse input.
3
Pin J5-2 J5-3 J5-4 J5-5 J5-6 J6-1 J6-2
Name VDD GND PGD PGC VIN GND
Description This is the programming connector positive voltage input. This is the programming connector ground. This is the programming connector data input. This is the programming connector clock input. This pin is not connected. This is the coaxial power plug positive VIN input. VDD on J5-2 is disconnected when J6-1 is used. This is the coaxial power plug ground.
IM 1 8 0 0 I/O
R 1 -2 8
V IN
P a d L a b e ls
V IN VOUT GND
PROGRAM (R J 4 5 -6 )
GND V IN VOUT B IN D D IG IT A L IN ANALOG IN D IG IT A L O U T S E R IA L R X S E R IA L T X GND
USB (T y p e B )
R 1 -1
Figure 1
4
IM 1 8 0 0 M o u n tin g D im e n s io n s
1 .3 (3 3 .0 2 ) 1 .7 (4 3 .1 8 ) 0 .2 (5 .0 8 )
2 .6 (6 6 .0 4 )
0 .8 5 (2 1 .5 9 ) 0 .2 (5 .0 8 ) 0 .4 (1 0 .1 6 ) 2 .4 (6 0 .9 6 ) m o u n tin g h o le d ia m e te r 0 .1 2 5 ( 3 .1 7 5 ) d im e n s io n s in in c h e s ( m m )
Figure 2
Note: Specifications subject to change without notice.
file: IM1800h.vp, 2005.12.18 rev
5

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