ST CONFIDENTIAL SPLML-868 and SP1ML-915 SPIRIT1 868 and 915 MHz Low Power RF Modules PRELIMINARY DATASHEET Features Complete RF ready Spirit1 module Integrated antenna and crystal STM32L microcontroller up to 32 MHz Low power consumption UART interface with AT command set Operates from a single 1.8V to 3.6V supply 863 to 870 MHz operation (SP1ML-868) 902 to 928 MHz operation (SP1ML-915) Output power up to +11.
Contents 1 Description ........................................................................................... 4 2 Hardware specification........................................................................ 5 3 4 2.1 Recommended operating conditions ......................................................................... 5 2.2 Absolute maximum ratings ........................................................................................ 5 2.3 I/O operating characteristics ..............
List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 12. Recommended operating conditions .................................................................................... 5 Absolute maximum ratings ................................................................................................... 5 I/O operating characteristics ................................................................................................. 5 Current consumption .................
1 Description The SP1ML-868 and SP1ML-915 are low power RF modules based on the SPIRIT1 radio, with integrated voltage regulation, antenna, crystal and microcontroller in a compact surface mount module form-factor. The module allows OEMs to easily add wireless capability to any electronic device without requiring in-depth RF experience, and has the necessary FCC modular approvals and CE compliance to reduce time to market. The UART host interface allows simple connection to an external microcontroller.
2 Hardware specification General conditions (VIN = 3 V and TA = 25˚C). 2.1 Recommended operating conditions Table 1. Symbol 2.2 Parameter Min. Typ. Max. Unit TA Operating ambient temperature range -40 - 85 ˚C VDD Operating supply voltage 1.8 3 3.6 V FREQ RF frequency (SP1ML-868) 863 - 870 MHz FREQ RF frequency (SP1ML-915) 902 - 928 MHz Min. Typ. Max. Unit Absolute maximum ratings Table 2. Symbol 2.
2.4 Current consumption Table 4. Current consumption Symbol IDD 2.5 Parameter Supply current Test Conditions Typ. Unit 20 mA 8 mA 11 mA Operating mode – Idle 800 µA Command mode 1.3 mA Standby 1.4 µA Operating mode Tx, +11dBm, 2-FSK, 915 MHz Operating mode Tx, -7dBm, 2-FSK, 915 MHz Operating mode Rx, 915 MHz RF compliance limits The RF compliance limits are those tested for FCC and CE certification. These limits are enforced by the factory loaded firmware. Table 5.
2.6 Pin assignment Table 6.
2.7 Pin placement Figure 1. Pin placement 2.8 1 16 2 15 3 14 4 13 5 12 6 11 7 10 8 9 Hardware block diagram Figure 2. Hardware block diagram XTAL 1.8V to 3.6V Supply UART SPI STM32L GPIO 8/19 Microcontroller GPIO SMPS Spirit1 RXp RXn Filter/Balun TX Doc ID TBD Rev 0.8 R www.st.
3 Hardware design 3.1 Pin usage If used with the default firmware and interfaced to a host MCU, at a minimum the SP1ML module requires power, ground and UART transmit and receive signals to be connected. Other signals are optional and provide additional functionality. These signals are outlined in the following table. Unused signals must not be connected. Table 7. Module pin usage Pin Name Description 1 TXRXLED 2 WKUP 3 GPIO0 Reserved for future use, do not connect.
3.2 Typical application circuit In a typical application the SP1ML module is connected to a host MCU using a standard UART, with transmit and receive signals. This is illustrated in the following diagram. Figure 3. Typical application circuit VDD VDD 1 10uF VDD HOST MCU TXD TXD RXD RXD RTS RTS CTS CTS GPIO MODE0 GPIO WKUP TXRXLED SP1ML MODULE 2 VDD SWCLK SWDIO 3 SWD HEADER RESET GPIO BOOTMODE GPIO RESET 4 5 GND Optional Functionality 1.
3.3 Layout guidelines The application PCB requires a flooded ground plane. Care must be taken to ensure there are no traces or ground planes under the area surrounding the antenna, with the exception of minimal width traces from pins 1,2,3,4,13,14,15 and 16 of the module if these are used. It is appropriate to place the module toward the edge of the PCB with no traces or ground planes from the antenna to the board edge. Figure 4.
3.4 Recommended footprint Figure 5. Recommended footprint 15.5 mm 10.5 mm 1.5 mm 1 mm 0.75 mm 12/19 1.5 mm Doc ID TBD Rev 0.8 R www.st.
3.5 Module reflow installation The SP1ML is a surface mount module supplied on a 16-pin, 4-layer PCB. The final assembly recommended reflow profile is indicated below, based on IPC/JEDEC JSTD020C, July 2004 recommendations. Table 8. Soldering profile Profile feature Average ramp-up rate (TSMAX to TP) Preheat: – Temperature min. (TS min.) – Temperature max. (TS max.) – Time (ts min. to ts max.
4 Mechanical data Figure 7. Mechanical data 14 mm 1.45 mm 13.4 mm 1.5 mm 1 mm 0.6 mm R 0.6 mm 2.5mm (max.) 4.1 RoHS compliance ST modules are RoHS compliant and comply with ECOPACK® norms. 14/19 Doc ID TBD Rev 0.8 R www.st.
5 Regulatory compliance 5.1 FCC certification This module has been tested and found to comply with the FCC part 15 rules. These limits are designed to provide reasonable protection against harmful interference in approved installations. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
5.3 Labeling instructions When integrating the SP1ML-915 into the final product, the OEM must ensure that the FCC labeling requirements are satisfied. A statement must be included on the exterior of the final product which indicates the product includes a certified module.
In the case where an OEM seeks the lesser category of a Class A digital device for the final product, the following statement must be included in the final product manual: NOTE: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
6 Ordering Information Table 9. 18/19 Ordering information Order code Description SP1ML-868 868 MHz Spirit 1 antenna module (Region 1, Europe) SP1ML-915 915 MHz Spirit 1 antenna module (Region 2, The Americas) Doc ID TBD Rev 0.8 R www.st.
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