WT12-A D a t a S h e e t V e r s i o n 1 .
Copyright © 2000-2006 Bluegiga Technologies All rights reserved. Bluegiga Technologies assumes no responsibility for any errors, which may appear in this manual. Furthermore, Bluegiga Technologies reserves the right to alter the hardware, software, and/or specifications detailed herein at any time without notice, and does not make any commitment to update the information contained herein. Bluegiga Technologies’ products are not authorized for use as critical components in life support devices or systems.
Contents: 1. Device Features Overview .......................................................................... 4 2. General Description.................................................................................... 5 2.1 Physical Outlook ..........................................................................................5 2.2 Block Diagram and Descriptions.....................................................................6 2.2.1 BlueCore04 ............................................
9.1.3 9.2 Current Consumption in UART Bypass Mode ............................................. 21 USB Interface ........................................................................................... 22 9.2.1 USB Data Connections .......................................................................... 22 9.2.2 USB Pull-Up Resistor ............................................................................ 22 9.2.3 Power Supply .................................................................
1. DEVICE FEATURES OVERVIEW • Fully Qualified Bluetooth system v2.0 + EDR, CE and FCC • Integrated chip antenna • Industrial temperature range from -40oC to +85oC • Enhanced Data Rate (EDR) compliant with v2.0.E.2 of specification for both 2Mbps and 3Mbps modulation modes • RoHS Compliant • Full Speed Bluetooth Operation with Full Piconet • Scatternet Support • USB version 2.0 compatible • UART with bypass mode • Support for 802.
2. GENERAL DESCRIPTION 2.
2.2 Block Diagram and Descriptions Figure 2: Block Diagram of WT12 2.2.1 BlueCore04 BlueCore4 is a single chip Bluetooth solution which implements the Bluetooth radio transceiver and also an on chip microcontroller. BlueCore4 implements Bluetooth® 2.0+EDR (Enhanced Data Rate) and it can deliver data rates up to 3 Mbps. The microcontroller (MCU) on BlueCore04 acts as interrupt controller and event timer run the Bluetooth software stack and control the radio and host interfaces.
2.2.2 Crystal The crystal oscillates at 26MHz. 2.2.3 Flash Flash memory is used for storing the Bluetooth protocol stack and Virtual Machine applications. It can also to the optional external RAM for memory intensive applications. 2.2.4 Balun/Filter Combined balun and filter changes the balanced input/output signal of the module to unbalanced signal of the monopole antenna. The filter is a band pass filter (ISM band). 2.2.5 Matching Antenna matching components match the antenna to 50 Ohms. 2.2.
Since the details of some methods are proprietary (e.g. Intel WCS) please contact Bluegiga for details. 2.
3. PHYSICAL LAYER SPECIFICATIONS The common physical layer specifications are shown in the table below. Item Specification Operating Frequency 2400 MHz to 2483.5 MHz (ISM-Band) Carrier Spacing 1.
4. GENERAL SPECIFICATIONS Item Specification Supply voltage 3.3 V ± 0.1 V regulated voltage. (Noise < 10 mVP-P) Supply current Maximum current in TX mode: 70.0mA Maximum current in RX mode: 70.0mA Frequency range 2400 MHz … 2483.5 MHz (ISM-Band) Guard band 2 MHz < F < 3.
Transmission power Minimum: -11 …-9 dBm Maximum +1 … +3 dBm RF input impedance 50 Ω Baseband crystal OSC 26 MHz Output interfaces 6 GPIO, PCM, SPI, UART, USB Operation temperature -40ºC … +85ºC Storage temperature -40ºC … +105ºC Compliance Bluetooth specification, version 2.0 + EDR USB specification USB specification, version 1.
5. ELECTRICAL CHARASTERISTICS Rating Storage temperature Min Max -40°C +150°C Table 3: Absolute Maximum Ratings Operating conditions Min Max Operating Temperature Range: -40°C +85°C Supply Voltage: VDD 3.2V 3.4V Table 4: Recommended Operating Conditions Digital terminals Min Typ Max Unit -0.4 +0.8 V 0.7VDD VDD+0.1 V 0.2 V Input voltage VIL input logic level low (VDD=3.3V) VIH input logic level high Output voltage VOL output logic level (VDD=3.3V) (lo = 3.
6. WT12 PIN DESCRIPTION The PIN description of WT12 is shown in the table below. No.
18 PIO6 I/O Programmable I/O lines 19 PIO7 I/O Programmable I/O lines 20 PIO4 I/O Programmable I/O lines 21 NCSB I 22 SCLK I/O 23 MISO O SPI data output (pull down) 24 MOSI I SPI data input (pull down) 25 PIO5 I/O 26 TXD O UART TX (internal pull up) 27 NC - NC, not used in WT12-A module 28 GND GND Ground 29 GND GND Ground 30 NC NC 31 GND GND Chip selection for SPI (internal pull up, active low) SPI Clock (internal pull down) Programmable I/O lines Not use
7.
Figure 5: PCB design around ACX antenna Figure four above illustrates how PCB design around the antenna of WT12 should be made. The most important thing is that there is no copper (ground plane or traces) underneath or in the close proximity of the ACX antenna. It’s also very important to have grounding vias all the way in the border between ground plane and free space, as illustrated with black and gray dots in figure 4.
8.
9. PHYSICAL INTERFACES 9.1 UART Interface WT12 Universal Asynchronous Receiver Transmitter (UART) interface provides a simple mechanism for communicating with other serial devices using the RS232 standard1. UART_TX UART_RX WT12 UART_RTS UART_CTS Figure 7: WT12 UART interface Four signals are used to implement the UART function, as shown in Figure 11.12. When WT12 is connected to another digital device, UART_RX and UART_TX transfer data between the two devices.
Parity Number of stop bits Bits per channel None, Odd, Even 1 or 2 8 Figure 8: Possible UART settings The UART interface is capable of resetting WT12 upon reception of a break signal. A Break is identified by a continuous logic low (0V) on the UART_RX terminal, as shown in Figure is longer than the value, defined by the PS Key below If tBRK PSKEY_HOST_IO_UART_RESET_TIMEOUT, (0x1a4), a reset will occur. This feature allows a host to initialize the system to a known state.
Persistent store value Baud rate Error Hex Dec 1200 0x0005 5 1.73% 2400 0x000a 10 1.73% 4800 0x0014 20 1.73% 9600 0x0027 39 -0.82% 19200 0x004f 79 0.45% 38400 0x009d 157 -0.18% 57600 0x00ec 236 0.03% 76800 0x013b 315 0.14% 115200 0x01d8 472 0.03% 230400 0x03b0 944 0.03% 460800 0x075f 1887 -0.02% 921600 0x0ebf 3775 0.00% 1382400 0x161e 5662 -0.01% 1843200 0x1d7e 7550 0.00% 2765800 0x2c3d 11325 0.
9.1.1 UART Configuration While RESET is Active The UART interface for WT12 while the chip is being held in reset is tri-state. This will allow the user to daisy chain devices onto the physical UART bus. The constraint on this method is that any devices connected to this bus must tri-state when WT12reset is deasserted and the firmware begins to run. 9.1.2 UART Bypass Mode Alternatively, for devices that do not tri-state the UART bus, the UART bypass mode on WT12 can be used.
9.2 USB Interface WT12 USB devices contain a full speed (12Mbits/s) USB interface that is capable of driving a USB cable directly. No external USB transceiver is required. The device operates as a USB peripheral, responding to requests from a master host controller such as a PC. Both the OHCI and the UHCI standards are supported. The set of USB endpoints implemented can behave as specified in the USB section of the Bluetooth v2.
PIO R =1.5kΩ USB_D+ WT12 USB_DUSB_ON R R Figure 12: USB in self powered mode The terminal marked USB_ON can be any free PIO pin. The PIO pin selected must be registered by setting PSKEY_USB_PIO_VBUS to the corresponding pin number. In self powered mode PSKEY_USB_PIO_PULLUP must be set to match with the PIO selected. Note: USB_ON is shared with WT12 PIO terminals (PIO2-PIO7).
9.2.5 Bus Powered Mode In bus powered mode the application circuit draws its current from the 5V VBUS supply on the USB cable. WT12 negotiates with the PC during the USB enumeration stage about how much current it is allowed to consume. For WT12 Bluetooth applications, it is recommended that the regulator used to derive 3.3V from VBUS is rated at 100mA average current and should be able to handle peaks of 120mA without fold back or limiting. In bus powered mode, WT12 requests 100mA during enumeration.
9.2.7 Detach and Wake-Up Signaling WT12 can provide out-of-band signaling to a host controller by using the control lines called ‘USB_DETACH’ and ‘USB_WAKE_UP’. These are outside the USB specification (no wires exist for them inside the USB cable), but can be useful when embedding WT12 into a circuit where no external USB is visible to the user.
USB compliant and can bear the USB logo. Such qualification can be obtained from a USB plug fest or from an independent USB test house. Terminals USB_DP and USB_DN adhere to the USB specification 2.0 (Chapter 7) electrical requirements. 9.2.10 USB 2.0 Compatibility WT12 is compatible with USB v2.0 host controllers; under these circumstances the two ends agree the mutually acceptable rate of 12Mbits/s according to the USB v2.0 specification. 9.
PIO[6] / CLK_REQ This is multifunction terminal, its function is determined by Persistent Store Keys. Using PSKEY_CLOCK_REQUEST_ENABLE, (0x246) this terminal can be configured to be low when WT12 is in deep sleep and high when a clock is required. The clock must be supplied within 4ms of the rising edge of PIO[6] to avoid losing timing accuracy in certain Bluetooth operating modes. PIO[7] Programmable I/O terminal. 10.
11.1 iWRAP Stack iWRAP RFCOMM SDP L2CAP HCI LM LC 48kB RAM UART Host Host I/O I/O PCM Baseband MCU Radio PCM I/O Figure 15: WRAP THOR VM Stack In figure above, the iWRAP software solution is described. In this version of the stack firmware shown no host processor is required to run the Bluetooth protocol stack. All software layers, including application software, run on the internal RISC processor in a protected user software execution environment known as a Virtual Machine (VM).
12. FCC STATEMENT Federal Communications Commission (FCC) Statement 15.21 You are cautioned that changes or modifications not expressly approved by the part responsible for compliance could void the user’s authority to operate the equipment. 15.105(b) This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
13. CONTACT INFORMATION Sales: sales@bluegiga.com Technical support: support@bluegiga.com http://www.bluegiga.com/techforum/ Orders: orders@bluegiga.com Head Office / Finland Phone: +358-9-4355 060 Fax: +358-9-4355 0660 Street Address: Sinikalliontie 11 02630 ESPOO FINLAND Postal address: P.O. BOX 120 02631 ESPOO, FINLAND Sales Office / USA Phone: (781) 556-1039 Bluegiga Technologies, Inc.
