dlp-rf2proto preliminary prototyping platform for the dlp-rf2 transceiver general description the dlp-rf2proto makes easy work of experimenting with the dlp-rf2 trans c e iver. it is perfec t ly suited for easily connecting the dlp-rf2 transceiver to a host windows/linux/mac pc via usb interface such that proposed serial host firmware can be modeled before being programmed into your dedicated microcontroller. using the virtual com port (vcp) drivers, the usb interface appears to the host program as a standard rs232c serial port. or, you can add your own microcontroller to the prototyping area to get a jumpstart on developing your new product that will incorporate the dlp-rf2. level converter circuitry and a db9 male connector are provided fo r connection to a legacy rs232c device. standard serial rx and tx signals (0 & 3 volt) are provided for communicating with the dlp-rf2 transceiver. selected baud rates (2400, 4800, 9600 (defaul t), 14400, 19200, 38400, 128000, 250000 baud) can be used to communicate with the rf2 via either the usb or db9 interfaces. the dlp-rf2proto directly accepts the dlp-rf2 tr ansceiver via a female 20-pin connector. eight buffered led?s and switches are provided for digita l i/o line manipulation/indication and can be disabled for low power designs. external power jacks and sele ction jumpers are provided to allow power source selection. power for the dlp-rf2proto board can be taken from the usb interf ace, external 4-15 volt dc power supply (purchased separately), or 9-volt battery (not included). an on-board 3-volt regulator is provided for controlling the voltage pr esented to the dlp-rf2 transceiver. a bdm interface header is also provided for ma king easy connection to the dlp-rf2?s programming interface for users that want to use their own cust om firmware. firmware programming requires the use of a device programmer (purchased separately). refer to the schematic for the dlp-rf2proto board located at the end of this document for additional details. rev 1.0 (march 2005) dlp-rf2proto ? dlp design, inc. 1
usb interface a usb interface is provided in the event that the user wants to test out a system design using the programming resources of a host pc. serial host so ftware used to communicate with the dlp-rf2 can be developed and tested using standard pc development tools (compilers/ debuggers/etc.) that will ultimately execute in a user-supplied microcontrolle r/dsp/etc. if a system requires permanent connection to a host computer then the dlp-rf1 should be used instead of the dlp-rf2 and dlp-rf2proto combination as the dlp-rf1 has its ow n usb interface for host communications. the usb interface on the dlp-rf2proto, in conjunc tion with the dlp design rftestap software, can be used to easily set/change the communications par ameters of the dlp-rf2 transceiver. the rftestap software and its visual c++ source code can be downloaded from the dlp design website upon purchase of the dlp-rf2proto. the communications interface between the ft232bm usb ic and the dlp-rf2 transceiver is bi-direction 3-volt serial data over a 2-wire (tx/rx) connec tion. only selected baud rates (2400, 4800, 9600, 14400, 19200, 38400, 128000, 250000 baud) can be used to communica te with the dlp-rf2, with the default being 9600 baud. the baud rate is set by the host application at run time. operational power for the dlp-rf2proto and dlp- rf2 can be taken from the host pc via the usb interface. all that is required is a user-supplied, 6-foot usb cable and to set the power select jumper (jp5) correctly. the power select jumper settings are covered in the next section. if using windows xp (sp1 or more recent) or linux (kernel 2.4.0 and greater) the vcp drivers for the usb port on the host computer should already be loaded and ready for use. otherwise, vcp drivers for the operating system in use can be downloaded from www.dlpdesign.com . to load the drivers, simply connect the dlp-rf2proto to the usb port of the host computer. a wizard will appear requesting the location of the drivers. once the wizard has finished, device manager should be opened to verify the presence of a new com port in the ?ports com & lpt? section. power-selection jumpers jumper jp5 allows a power source to be selected as outlined in table 1. position pow e r source selected 1-2 external 4-15vdc power supply 3-4 battery c lips for 9-volt battery or 6- volt batter pac k 5-6 usb port power table 1 switches and led?s all available i/o lines from the dlp-rf2 are made available on connector cn2. the switches and led?s on the dlp-rf2proto board are used primarily for digi tal i/o (a6, b6-b0) indication and control. if a data line is set to be an input to the microcontroller wi th the internal pull-ups disabled, the 1m ohm pull- down resistors will keep the line from oscillating. if set to an input with the internal pull-up resistors enabled, the line will be held high as the internal pull-ups can easily overcome the 1m pull-down resistors. the 8 switches at position sw1 can be used to simulate inputs from the user interface. care should be taken to prevent turning ?on? a switch for an i/o line t hat is set to output and high as this will short the line to ground and possibly damage the microcontroller on the dlp-rf2. rev 1.0 (march 2005) dlp-rf2proto ? dlp design, inc. 2
the 8 leds indicate the current state of each digital i/o line and are buffered such that minimal current is drawn from the microcontroller on the dlp-rf2. an in verting buffer is used so that when a digital i/o line is high, the associated led will be on. if developi ng a low-power design, the jumper at jp9 can be removed so that power consum ption is greatly reduced. db9 interface the dlp-rf2proto provides a db9 connector and leve l converter circuitry for connection to a legacy rs232c device. this interface is provided to assist the developer in writing cu stom firmware and system control software for instances where communicati on is required between the dlp-rf2 and a piece of equipment that would normally connect to a host computer via rs232c. standard baud rates supported (limited by the dl p-rf2) are 2400, 4800, 9600 (default), 14400, 19200, 38400, 128000, and 250000 baud). a jumper (jp10) is provided for re moving power from the db9 interface circuitry in the even the user is developing a low-power device. low power mode jumper jumper jp6 can be used to hold port pin rx2/c1 low at power up of the dlp-rf2. if using the sipp firmware in the dlp-rf2 as shipped from dlp desi gn, on power up the rf2 will immediately enter the low-power mode drawing less than 40 microamps of cu rrent at pin 12 of interface connector cn5. the rf2 module will wake up periodically from the low-pow er mode and attempt to check in with the system controller. once communications with the host contro ller are complete, the rf2 will return to low-power mode. several factors can prevent the rf2 from achieving the specified low-power current level of less than 40 microamps. current draw from a digital i/o pin into user electronics, pulling low on a digital i/o line while an internal pull-up in the microcontroller is enabled, or excessive activity on a monitored digital input are three examples of items that should be av oided if attempting to minimize current. refer to the datasheet for the dlp-rf2 for additi onal details on the low-power mode of operation. bdm header the bdm interface header is provided for making easy connection to the mc9s08gt60 microcontroller on the dlp-rf2 transceiver for programming user pr ovided custom firmware. firmware programming through the bdm interface requires the use of a device programmer (purchased separately). current monitor jumpers jumpers jp1 and jp4 are provided for allowing the us er to easily connect an ammeter and monitor either the current drawn from the 3 volt regulator or the current drawn by the dlp-rf2 transceiver. simply remove the jumper and connect a current mete r in series to make the measurement. rev 1.0 (march 2005) dlp-rf2proto ? dlp design, inc. 3
rev 1.0 (march 2005) dlp-rf2proto dlp design, inc. 4 mc9s08gt60 a/d converter the freescale mc9s08gt60 microcontroller on the dlp-rf2 transceiver module has a 10-bit a/d converter that is accessible via the 20-pin header on the dlp-rf2. a reference voltage must be applied to pin 4 of the interface connector on the dlp-rf2pro to for the a/d to function correctly. this voltage will be the maximum voltage that can be measured by the a/d converter and must be in the range of 2.08 to 3vdc. the dlp-rf2proto provides a jumper (jp2) that allows for selection between the 3-volt power supply or a user-supplied external reference for the a/d?s voltage reference. additionally, a potentiometer (vr1) is provided that allows for experim entation with the a/d inputs. the potentiometer can be driven by either the 3-volt power supply or t he external voltage reference. for additional details on the use of the a/d converte r please refer to the datasheets for the dlp-rf2 and the mc9s08gt60 microcontroller. disclaimer neither the whole nor any part of the informati on contained herein or the product described in this datasheet may be adapted or reproduced in any material or electronic form without the prior written consent of the copyright holder. this product and its documentation are supplied on an as -is basis, and no warranty as to their suitability for any particular purpose is either made or implied. dlp design will not accept any claim for damages whatsoever arising as a result of use or failure of this product. your statutory rights are not affected. this product or any variant of it is not intended for use in any medical appliance, device, or system in which the failure of the product might reasonabl y be expected to result in personal injury. this document provides preliminary informati on that may be subject to change without notice. contact information dlp design, inc. 1605 roma ln. allen, tx 75013 phone: 469-964-8027 fax: 415-901-4859 email: support@dlpdesign.com internet: http://www.dlpdesign.com
5 5 4 4 3 3 2 2 1 1 d d c c b b a a dc:4-15v breadboard dlp-rf2proto --> --> --> --> rs232c usb vref pot source select a/d ** external vref range: 2.08 - 3vcc d2 d3 d4 d5 d6 d7 d8 b4 b6 a6 rx1/e1 bkgd b3 b2 b0 tx1/e0 b1 b5 tx2/c0 reset# reset# 3vcc usbvcc b0 b5 b3 b1 b6 tx1/e0 b4 b2 a6 rx2/c1 3vcc tx2/c0 rx1/e1 reset# 3vcc usbvcc 3vcc usbvcc rx1/e1 tx1/e0 3vcc b3 b2 b6 b1 b5 b4 a6 b0 bkgd extref** 3vcc extref** vpot vpot 3vcc extref** rx2/c1 rx2/c1 3vcc c16 47pf c9 10/10 tant c12 0.1uf u1 max3221e/so 8 11 14 9 10 13 2 4 5 6 3 7 1 12 16 15 rin tin gnd rout invalid tout c1+ c1- c2+ c2- v+ v- en forceon forceoff vcc u3 74240 20 10 2 4 6 8 11 13 15 17 18 16 14 12 9 7 5 3 1 19 vcc gnd in1 in2 in3 in4 in5 in6 in7 in8 out1 out2 out3 out4 out5 out6 out7 out8 oe1 oe2 cn4 dc barrel jack 2 3 1 led x 7 d1 c2 .01 c15 0.1uf jp7 --> 1 2 3 jp8 <-- 1 2 3 cn3 db9 5 9 4 8 3 7 2 6 1 bdm 1 2 3 4 5 6 r4 470 c10 0.1uf r2 27r c11 0.1uf c5 .1 r3 27r c7 10/10 tant c6 .01uf cn2 jumper wire header 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 fb1 240-1018-1 1 2 c14 0.1uf sw1 sw dip-8 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 jp6 low power mode jumper 1 2 c20 .1 rp2 100 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 cr1 6mhz . .. cn1 usb conn. 1 2 3 4 jp1 current monitor jumper 1 2 bt1 9v, 6v battery pack clips r1 10k cn5 rf2 interface header 1 3 5 7 9 11 13 15 17 19 2 4 6 8 10 12 14 16 18 20 c1 47pf rp1 1m 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 c3 .47uf jp3 1 2 3 c4 10/10 tant c18 .1 c8 1uf/10v jp10 power disable 1 2 c19 .1 r7 1.5k u2 pq1l303m2sp 4 2 3 1 5 in gnd cin cout out vr1 resistor var c17 .033 c13 0.1uf jp4 current monitor jumper 1 2 jp5 power select 1 2 3 4 5 6 jp9 led power 1 2 u4 ft232bm 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 eesk eedata vcc reset# reseto# 3v3out usbdp usbdm gnd sleep# rxled# txled# vcc-io pwrctl pwren# txden gnd ri# dcd# dsr# dtr# cts# rts# rxd txd vcc xtin xtout agnd avcc test eecs jp2 1 2 3 r6 10
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