A Datasheet AC4490 Version 4.
AC4490 Datasheet REVISION HISTORY Version 4.2 Date 16 Dec 2013 Notes Contributors Separated into two separate docs (Hardware Integration Guide and User Guide). Information in this document was originally part of the User Guide. Approver Sue White Added a Related Documents section. Note: Starting at Rev 4.2 to match the current User Guide. Updated Serial Interface information to: 4.3 09 Apr 2014 Serial Interface and Digital I/O 3.
AC4490 Datasheet CONTENTS 1 AC4490 RF Transceiver ...................................................................................................................................................... 5 1.1 2 Overview .................................................................................................................................................................... 5 Features .................................................................................................................
AC4490 Datasheet 14.2 15 Passive Resistor Voltage Divider ............................................................................................................................. 29 Appendix II: Sample Power Supply ................................................................................................................................... 30 15.1 Bill of Materials ..................................................................................................................................
AC4490 Datasheet 1 AC4490 RF TRANSCEIVER The compact AC4490 900 MHz transceiver can replace miles of cable in harsh industrial environments. Using field-proven frequency hopping spread spectrum (FHSS) technology which needs no additional FCC licensing in the Americas, OEMs can easily make existing systems wireless with little or no RF expertise. 1.
AC4490 Datasheet GENERAL Antenna AC4490-1x1: Customer must provide AC4490-200: External antenna with MMCX plug or integral antenna AC4490-1000: External antenna with MMCX plug Serial Interface and I/O 3.
AC4490 Datasheet TRANCEIVER Brazilian regulations have a receive sensitivity of -80 dBm.
AC4490 Datasheet AC44901x1 / AC4490-1000M AC4490-200X Signal Name High Min. High Max. Low Min. Low Max. High Min. High Max. Low Min. Low Max. Unit GI1 2.31 3.3 0 0.99 2 5.5 0 0.8 V UP_RESET 0.8 3.3 0 0.6 0.8 5 0 0.6 V 2.31 3.3 0 0.99 2 5.5 0 0.8 V N/A 3.3 0 N/A N/A 3.3 0 N/A V CMD /Data AD In Table 3: Output Voltage Characteristics Signal Name Module Pin 1x1 Pin Type High Min. Low Max. Unit GO0 1 19 O 2.5 @ 8 mA 0.4 @ 8 mA V TXD 2 6 O 2.
AC4490 Datasheet Figure 1: Pending RF Buffer Flow https://www.lairdconnect.
AC4490 Datasheet 5 HARDWARE 5.1 Pin Definitions The AC4490 has a simple interface that allows OEM host communications with the transceiver and shows the connector pin numbers and associated functions. Table 4: AC4490 Pin Definitions Module Pin 1x1 Pin Type Signal Name 1 4 O GO0 Generic Output pin 2 6 O TXD Serial data output from the module to the OEM Host. 3 7 I RXD Serial data input to the module from the OEM Host.
AC4490 Datasheet Module Pin 1x1 Pin Type Signal Name Function reset the transceiver. 16 13 GND GND 17 17 I 18 152 I AD In 10-bit Analog Data Input 19 203 O DA_Out 10-bit Analog Data Output 20 18 O N/A 14 RF N/A 22 I CMD /Data In_Range RF Port Reset Signal Ground When logic Low, the transceiver interprets OEM Host data as command data. When logic High, the transceiver interprets OEM Host data as transmit data.
AC4490 Datasheet 5.2 Pin Descriptions 5.2.1 Generic I/O Both GI0 and GI1 pins serve as generic input pins and both GO0/1 pins server as generic output pins. Reading and writing of these pins can be performed using CC Commands. These pins alternatively serve as control pins when modem mode is enabled. 5.2.2 TXD & RXD Serial TTL The AC4490-200 accepts 3.3 or 5 V DC TTL level asynchronous serial data on the RXD pin and interprets that data as either command data or transmit data.
AC4490 Datasheet 5.2.7 RSSI Instantaneous RSSI Received Signal Strength Indicator can be used by the OEM Host as an indication of instantaneous signal strength at the receiver. The OEM Host must calibrate RSSI without an RF signal present at the receiver. Calibration is accomplished by following these steps: 1. Power up only one transceiver in the coverage area. 2. Measure the RSSI to obtain the minimum value with no other signal present. 3.
AC4490 Datasheet 5.2.11 In Range Asserts logic Low when a client transceiver is in range of a server radio operating on the same RF Channel and System ID. If a client cannot hear a server for the amount of time defined by Range Refresh, it will drive In_Range high and enter search mode looking for a server. When a server is detected, In_Range will always report Low on server transceivers.
AC4490 Datasheet Data Bits Parity Stop Bits Transceiver Programming Requirements 7 E, O, M, S 1 Parity Disabled 9 N 1 Parity Enabled 8 N 2 Parity Enabled 8 E, O, M, S 1 Parity Enabled 7 E, O, M, S 2 Parity Enabled Mark (M) corresponds to 1 & Space (S) corresponds to 0 6.4 Serial Interface Baud Rate This two-byte value determines the baud rate used for communicating over the serial interface between the OEM Host and the transceiver.
AC4490 Datasheet 7 RADIO INTERFACE 7.1 Protocol Status / Receive Acknowledgement Note: Implemented in firmware v6.3 and later. When enabled in EEPROM, GO0 and GO1 perform the functions of Protocol Status and Receive Acknowledgement. 7.1.1 Protocol Status Every time the radio hops to hop bin 0, the radio asserts GO0 Low for the entire hop bin. GO0 goes low at the falling edge of the hop frame at the start of bin 0 and goes high with the rising edge of hop frame at the end of bin 0.
AC4490 Datasheet You can perform a successful design without monitoring CTS. However, you need to take into account the amount of latency the radio adds to the system, any additional latency caused by Transmit Retries or Broadcast Attempts, how often you send data, non-delivery network timeouts and interface data rate. Polled type networks, where the server host requests data from the client host and the client host responds, are good candidates for avoiding the use of CTS.
AC4490 Datasheet 8 SECURITY The AC4490 product family utilizes a Frequency Hopping Spread Spectrum (FHSS) technology which provides the foundation for secure digital wireless communications. This section describes how spread spectrum technology works and explains how an OEM can enable specific security features available in the AC4490. 8.1.
AC4490 Datasheet If FHSS technology, channel number, and system ID are not enough to secure your data, the AC4490 supports the Data Encryption Standard (DES), which is the third level of security. Encryption is the process of encoding an information bit stream to secure the data content. The algorithm described in this standard specifies both encrypting and decrypting operations which are based on a binary number called a key. A key of 56 bits is used to encrypt and decrypt the data.
AC4490 Datasheet 9 AC4490 MECHANICAL AND LAYOUT 9.1 Mechanical Drawings Interface Connector 20 pin OEM Interface connector (Molex 87759-0030, mates with Samtec SMM-110-02-S-D MMCX Jack 20 pin OEM Interface connector (Molex 87759-0030, mates with Samtec SMM-110-02-S-D Figure 5: AC4490 (with MMCX connector) Mechanical https://www.lairdconnect.
AC4490 Datasheet Figure 6: AC4490 - 1x1 Mechanical https://www.lairdconnect.
AC4490 Datasheet Figure 7: AC4490 1x1 PCB Considerations https://www.lairdconnect.
AC4490 Datasheet 10 AC4490 TIMING DIAGRAMS Figure 8: Addressed Mode with Timeout Figure 9: Addressed Mode with Fixed Packet Length Figure 10: Broadcast Mode with Timeout Figure 11: Broadcast Mode with Fixed Packet Length https://www.lairdconnect.
AC4490 Datasheet 11 ORDERING INFORMATION Part Type Interface Antenna Option Output Power AC4490-1000M Module 3.3V TTL MMCX Connector 1000 mW AC4490-200M Module 3.3V TTL MMCX Connector 200 mW (US, Canada Only) AC4490LR-1000M Module 3.3V TTL MMCX Connector 1000 mW (Long Range) DVK-AC4490LR-1000M Development Kit 3.3V TTL MMCX Connector 1000 mW (Long Range) 11.
AC4490 Datasheet 12.3 Approved Antenna List The following antennas are approved for use with the AC4490 as identified. The OEM may choose another vendor’s antenna of like type and equal or lesser gain as a listed antenna and still maintain compliance. Table 8: AC4490 Approved Antennas (for revision 1.
AC4490 Datasheet Reorient or relocate the receiving antenna. Increase the separation between the equipment and receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help. FCC Caution: Any changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate this equipment.
AC4490 Datasheet Information on Test Modes and Additional Testing Requirements Test tool: Laird Configuration and Test Utility Software (Range Test tab) shall be used to set the module to transmit continuously.
AC4490 Datasheet End Product Labeling The final end product must be labeled in a visible area with the following: “Contains ISED: 2268C-44901000 / 2268C-4x90200”. Plaque signalétique du produit final Le produit final doit être étiqueté dans un endroit visible avec l'inscription suivante: "Contient des ISED: 2268C-44901000 / 2268C-4x90200".
AC4490 Datasheet 12.7 Channel Warning The OEM must prevent the end-user from selecting a channel not approved for use by the governing body in the country in which this product is implemented. 13 REVISION 2.0 HARDWARE (AC4490-1000M, AC4490LR-1000M) The Qorvo RF power amplifier (RF2173) used on old pre-revision 2.0 hardware is now EoL (End of Life) and the redesigned revision 2.0 hardware uses a new Qorvo RF power amplifier (RF6886). Additionally, revision 2.
AC4490 Datasheet 15 APPENDIX II: SAMPLE POWER SUPPLY Below is a simple switching power supply that provides enough current to easily power any Laird OEM module. It utilizes low cost, off-the-shelf components that fit into a small area. This supply has an input voltage range of +6 volts to +18 volts and will output +3.4 volts at 1.5 amps. Included is a Bill of Materials with manufacturer’s name and part numbers, Schematic and a sample PCB Layout.
AC4490 Datasheet 15.2 Schematic 15.2.1 Switching Power Supply Figure 13: Power Supply Schematic 15.3 PCB Layout Figure 14: PCB Layout https://www.lairdconnect.
AC4490 Datasheet Figure 15: PCB Layout https://www.lairdconnect.
AC4490 Datasheet 16 APPENDIX III: PRODUCT THROUGHPUT Table 11: Product Matrix Part Number AC4490-1x1 AC4490-200 AC4490-1000 Size 1.0" x 1.0" x 0.125" 1.9" x 1.65" x 0.20" 1.9" x 1.65" x 0.20" Range Up to 1 mile Up to 4 miles Up to 20 miles Throughput 32 Kbps 32 Kbps 32 Kbps Current Draw RX 28 mA 30 mA 30 mA Current Draw TX 80 mA 106 mA 1300 mA Current Draw (Sleep Mode) 15 mA / 3 mA 19 mA / 6 mA 19 mA / 6 mA Chan 48 48 32 Band 900 MHz 900 MHz 900 MHz 3.
AC4490 Datasheet 17 RELATED DOCUMENTS AND FILES The following additional AC4490 technical documents are available from the AC4490 product page: (Documentation and Datasheet tabs) located on the Laird website: https://www.lairdconnect.
