AC4490 900 MHz OEM TRANSCEIVERS Specifications Subject to Change User’s Manual Version 1.5 10981 EICHER DRIVE LENEXA, KS 66219 (800) 492-2320 www.aerocomm.com wireless@aerocomm.
DOCUMENT INFORMATION Copyright Information Copyright © 2003 AEROCOMM, Inc. All rights reserved. The information contained in this manual and the accompanying software programs are copyrighted and all rights are reserved by AEROCOMM, Inc. AEROCOMM, Inc. reserves the right to make periodic modifications of this product without obligation to notify any person or entity of such revision.
DOCUMENT INFORMATION Revision Description Version 1.0 Version 1.1 Version 1.2 3/15/2002 – Initial Release Version 12/18/2002 – Preliminary Release 12/20/2002 – Preliminary Release. Changed location of new interface pins for higher compatibility with AC4424 product family. 1/29/2003 – Updated interface baud rate formula/table. Updated current consumption table. Corrected RSSI plot. Updated Interface Timeout information. Renamed product family to AC4490. Multiple byte EEPROM read/write now allowed.
FCC INFORMATION Agency Approval Overview Part Number AC4490-100 US/FCC X CAN/IC X EUR/EN Portable See Note 1 Mobile X-2.5cm* Fixed X-2.5cm* * See RF Exposure warning on next page Note 1: Specific Absorption Rating (SAR) testing required for portable applications. Agency Identification Numbers Part Number AC4490-100 US/FCC X CAN/IC X EUR/EN FCC Notice WARNING: This device complies with Part 15 of the FCC Rules.
FCC INFORMATION Approved Antenna List AC4490X-100 Note: We are still qualifying antennas and will add to this list as that process is completed. Item Part Number 1 S467FL-6-RMM-915S Mfg. Nearson Frequency Band Type 902 – 928MHz ½ Wave Dipole Gain (dBi) 2 PMF 2 S161AH-915R Nearson 902 – 928MHz ½ Wave Dipole 2.5 PMF 3 S331AH-915 Nearson 902 – 928MHz ¼ Wave Dipole 4 1020B5812-04 (Flavus 915) gigaAnt 902 – 928MHz ¼ Wave Snap-In 1 PMF -0.
FCC INFORMATION RF Exposure AC4490-100 WARNING: To comply with FCC RF Exposure requirements, the Original Equipment Manufacturer (OEM) must ensure that the approved antenna in the previous table must be installed and/or configured to operate with a separation distance of 2.5cm or more from all persons to satisfy RF Exposure compliance.
TABLE OF CONTENTS 1. OVERVIEW...................................................................................................................................... 9 2. AC4490 SPECIFICATIONS .......................................................................................................... 10 3. SPECIFICATIONS......................................................................................................................... 11 3.1 INTERFACE SIGNAL DEFINITIONS .............................
5.2 SOFTWARE PARAMETERS............................................................................................................... 28 5.2.1 RF Architecture (Unicast/Broadcast) ................................................................................... 28 5.2.2 RF Mode ............................................................................................................................... 29 5.2.3 Sub Hop Adjust ...............................................................................
AC4490 Specifications AC4490 Features ! ! ! ! ! ! ! ! ! Available in either 3.3V or 5V TTL level serial interface for fast integration Drop-in replacement for AC4424 2.
AC4490 Specifications 2.
AC4490 Specifications 3. Specifications 3.1 INTERFACE SIGNAL DEFINITIONS The AC4490 has a simple interface that allows OEM Host communications with the transceiver. Table 1 – Pin Definitions Definitions, shows the connector pin numbers and associated functions. The I/O direction is with respect to the transceiver. All outputs are 3.3VDC levels and inputs are 5VDC TTL with the exception of RSSI, AD In and AD Out, which are all analog.
AC4490 Specifications 3.2 ELECTRICAL SPECIFICATIONS Table 2 – Input Voltage Characteristics Pin 3 4 8 12 14 15 17 18 Type I I I I I I I I Name RXD GI0 RTS 9600_Baud GI1 UP_RESET Command/Data AD In High Min. 2 2 2 2 2 0.8 2 N/A High Max. 5.5 5.5 5.5 5.5 5.5 5.5 5.5 3.3 Low Min. 0 0 0 0 0 0 0 0 Low Max. 0.8 0.8 0.8 0.8 0.8 0.6 0.
AC4490 Specifications 3.3.2 Latency Times TBD 3.3.3 Maximum Overall System Throughput When configured as shown in the table below, an AC4490 transceiver is capable of achieving the listed throughput. However, in the presence of interference or at longer ranges, the transceiver may not be able to meet these specified throughputs. Table 4 – Maximum Overall System Throughputs RF Mode Interface Baud Rate Duplex FEC Direction Throughput (bps) Stream 57.6k Half Disabled One way TBD Stream 57.
AC4490 Specifications 4. Configuring the AC4490 4.1 EEPROM PARAMETERS A Host can program various parameters that are stored in EEPROM and become active after a poweron reset. Table 5 - EEPROM Parameters, Parameters gives the locations and descriptions of the parameters that can be read or written by a Host. Factory default values are also shown. Do not write to any EEPROM addresses other than those listed below. Do not copy a transceiver’s EEPROM data to another transceiver.
AC4490 Specifications Parameter Frequency Offset Transmit Retries Broadcast Attempts API Control Interface Timeout Sync Channel RF Packet Size CTS On CTS On Hysteresis Max Power Destination ID System ID MAC ID EEPROM Length Address (Bytes) Range Default 46H 1 00 – FFh 00h 4CH 1 01 – FFh 10h 4DH 56H 1 1 01 – FFh 58H 5AH 5BH 5CH 1 1 1 1 02 – FFh 00 – 3Fh 01 – 40h 01 – FFh 04h 01h 46h D2h 5DH 63H 70H 76H 80H 1 1 6 1 6 01 – FFh 00 – FFh ACh 60h 6 Bytes 01h 6 Bytes 00 – FFh Description
AC4490 Specifications 4.2.1 EEPROM Byte Read Upon receiving this command, a transceiver will transmit the desired data from the address requested by the Host. Host Command: Byte 1 = C0h Byte 2 = Address Byte 3 = Length (01…FFh = 1…255 bytes; 00h = 256 bytes) Transceiver Response: Byte 1 = C0h Byte 2 = Address Byte 3 = Length Byte 4…n = Data at requested address(s) 4.2.
AC4490 Specifications 4.3 ON-THE-FLY CONTROL COMMAND REFERENCE The AC4490 transceiver contains static memory that holds many of the parameters that control the transceiver operation. Using the “CC” command set allows many of these parameters to be changed during system operation. Because the memory these commands affect is static, when the transceiver is reset, these parameters will revert back to the settings stored in the EEPROM.
AC4490 Specifications 4.3.3 Change Channel with Forced Acquisition Sync The Host issues this command to change the channel of the transceiver and force the transceiver to immediately begin synchronization. Host Command: Byte 1 = CCh Byte 2 = 02h Byte 3 = RF Channel Number (Hexadecimal) Transceiver Response: Byte 1 = CCh Byte 2 = RF Channel Number (Hexadecimal) 4.3.
AC4490 Specifications 4.3.5 Sync to Channel Command The Host issues this command to change the Sync Channel byte. This will only affect operation when Sync to Channel is enabled in the EEPROM Host Command: Byte 1 = CCh Byte 2 = 05h Byte 3 = Data1 Where: Data1 = New Sync Channel Transceiver Response: Byte 1 = CCh Byte 2 = 05h Byte 3 = Data1 Where: Data1 = Data1 from Host Command 4.3.
AC4490 Specifications 4.3.8 Broadcast Mode The Host issues this command to change the transceiver operation between Addressed Mode and Broadcast Mode. Mode If addressed mode is selected the transceiver will send all packets to the radio designated by the Destination Address programmed in the transceiver. Host Command: Byte 1 = CCh Byte 2 = 08h Byte 3 = 00 for addressed mode, 01 for broadcast mode Transceiver Response: Byte 1 = CCh Byte 2 = 00 for addressed mode, 01 for broadcast mode 4.3.
AC4490 Specifications 4.3.11 Read Digital Inputs The Host issues this command to read both digital input lines. Host Command: Byte 1 = CCh Byte 2 = 20h Transceiver Response: Byte 1 = CCh Byte 2 = Data1 Where: Data1 = bit 0 – GI0, bit 1 – GI1 4.3.12 Read ADC The Host issues this command to read any of the three onboard A/D converters.
AC4490 Specifications 4.3.13 Report Last Valid RSSI As RSSI values are only valid when the local radio is receiving a RF packet from a remote radio, instantaneous RSSI can be very tricky to use. Therefore, the transceiver stores the most recent valid RSSI value. The Host issues this command to request that value. Note: This value will default to FFh if no valid RSSI measurement has been made.
AC4490 Specifications 4.3.15 Write DAC The Host issues this command to write AD Out to a particular voltage. NOTE: AD Out is an unbuffered, high impedance output and must be buffered by the OEM Host when used. Host Command: Byte 1 = CCh Byte 2 = 24h Byte 3 = Data1 Byte 4 = Data2 Where: Data1 = Update Period where: TUpdate = (255 * (Data1 + 1)) / 14.
AC4490 Specifications 4.3.17 Transmit Buffer Empty The Host issues this command to determine when the RF Transmit buffer is empty. The Host will not receive the transceiver response until that time.
AC4490 Specifications 5. Theory of Operation 5.1 HARDWARE INTERFACE Below is a description of all hardware pins used to control the AC4490. 5.1.1 GIn (Generic Inputs 0 and 1) (pins 4 and 14 respectively) and GOn (Generic Outputs 0 and 1) (pins 1 and 9 respectively) Both GIn pins, when enabled in EEPROM, serve as negative-going edge triggered generic input pins. Both GOn pins, when enabled in EEPROM, serve as generic output pins. The following functions can be accomplished with these pins.
AC4490 Specifications 5.1.4 CTS Handshaking (pin 7) The AC4490 has an interface buffer size of 256 bytes. If the buffer fills up and more bytes are sent to the transceiver before the buffer can be emptied, data corruption will occur. The transceiver prevents this corruption by asserting CTS High as the buffer fills up and taking CTS Low as the buffer is emptied. CTS On in conjunction with CTS On Hysteresis control the operation of CTS.
AC4490 Specifications Validated RSSI As RSSI values are only valid when the local radio is receiving a RF packet from a remote radio, instantaneous RSSI can be very tricky to use. Therefore, the transceiver stores the most recent valid RSSI value. The Host issues the Report Last Good RSSI command to request that value (details can be found in the On-the-Fly Control Command Reference). Validated RSSI is not available at the RSSI pin. Figure 1 – RSSI Voltage vs. Received Signal Strength 1.
AC4490 Specifications 5.1.10 AD In and AD Out (pins 18 and 19 respectively) When enabled in EEPROM, AD In and AD Out can be used as a cost savings to replace Analog-toDigital and Digital-to-Analog converter hardware. The following conditions are all possible when enabled in EEPROM. Note: AD Out is an unbuffered, high impedance output and must be buffered by the OEM Host when used.
AC4490 Specifications 5.2.2 RF Mode All radios located on the same network must use the same RF Mode. RF Delivery Overview All packets are sent out over the RF as either addressed or broadcast packets. Addressed packets are only received by the radio specified by Destination Address Address. If addressed packets are desired, the Destination Address should be programmed with the MAC ID of the destination radio.
AC4490 Specifications 5.2.4 Duplex Mode In Half Duplex mode, the AC4490 will send a packet out over the RF when it can. This can cause packets sent at the same time by a Server and a Client to collide with each other over the RF. To prevent this, Full Duplex Mode can be enabled. This mode restricts Clients to transmitting on odd numbered frequency “bins” and the Server to transmitting on even frequency bins. Though the RF hardware is still technically half duplex, it makes the radio seem full duplex.
AC4490 Specifications Table 6 – Baud Rate Baud Rate 115,200 57,600 38,400 28,800 19,200 14,400 9,600 4800 2400 1200 BaudL (42h) FEh FCh FAh F8h F4h F0h E8h D0h A0h 40h BaudH (43h) 00h 00h 00h 00h 00h 00h 00h 00h 00h 00h Minimum Interface Timeout (58h) 02h 02h 02h 02h 02h 03h 03h 05h 09h 11h 5.2.7 Network Topology RF Channel Number – RF Channel Number provides a physical separation between co-located networks. The AC4490 is a spread spectrum frequency hopping radio with a fixed hopping sequence.
AC4490 Specifications 5.2.8 Frequency Offset Frequency Offset is an AC4490 protocol parameter and should only be modified at the recommendation of Aerocomm. 5.2.9 Auto Config The AC4490 has several variables that control its RF performance and vary by RF Mode and RF Architecture. Enabling Auto Config will bypass the value for these variables stored in EEPROM and use Architecture predetermined values for the given Interface Baud Rate.
AC4490 Specifications 5.2.10 Max Power Max Power provides a means for controlling the RF transmit output power of the AC4490. The following table lists some common values for Max Power and their current consumption. Output power and current consumption can vary by as much as ±10% per radio. Table 9 – Max Power Settings Max Power (Address 63h) 100% Transmit Current (mA) Transmit Power Output(dBm) 00h 47 -20 01h 50 -10 02h 50.5 -3 03h 52 1 04h 55 4 05h 58.5 7 06h 63.5 9 07h 69 10.5 08h 76 12 09h 83 13.
AC4490 Specifications 6.
AC4490 Specifications 7. Dimensions All AC4490 products measure 1.9”L x 1.65”W.
Ordering Information 8. Ordering Information 8.1 PRODUCT PART NUMBER TREE 8.2 PRODUCT PART NUMBERS Order transceivers using the following part number tables: 3.3V, 100 mW Part Numbers 4.5 – 5.
Ordering Information 8.3 DEVELOPER KIT PART NUMBERS Order Developer Kits using the following part number tables: 4.5 – 5.5V, 200 mW Developer Kit Part Numbers SDK-AC4490I-100A-5 SDK-AC4490I-100M-5 All Developer Kits include (2) transceivers, (2) RS232 Serial Adapter Boards, (2) 6Vdc unregulated power supplies, (2) Serial cables, (2) S467FL-6-RMM-915S dipole antennas with 6” pigtail and MMCX connector, configuration/testing software, and integration engineering support.
