STM8L15LPBOARD low-power demonstration board
Contents
1. ky UM0774 Yy User Manual STM8L15LPBOARD low power demonstration board Introduction The STM8L15LPBOARD low power demonstration board demonstrates all the STM8L15x low power modes and permits the user to take consumption measurements in all modes Features SWIM debug support MCU consumption auto measurement circuit 32 768 kHz quartz E E m Function and wakeup buttons E m MCU pins connector Figure 1 The STM8L15LPBOARD PUUstitisiisiiiisiiitiit September 2009 Doc ID 16160 Rev 2 1 9 www st com Hardware layout STM8L15LPBOARD 2 9 Hardware layout Figure 2 STM8L15LPBOARD board layout top view KKKAKAAAKAKAKAAAKKAAAAA Egni elle STM8L152 Low Power DemoBoard ay N niia A97 MB870 B nege Function button RI2 EEE RIED a a daf man gA r gut Wakeup button T ee C24 C7 ET R29 zr lasal U4 ne pik 7 ih a mine 5 adi og een ICC id auto_measurement jue EE 5 mee Supply jumper SWIM connector JP3 CN3 Connector CN1 Doc ID 16160 Rev 2 ky STM8L15LPBOARD Hardware layout Figure 3 STM8L15LPBOARD board layout bottom view R I RSHEEE Ba cme a N 0000000008 C C9 CID Ct C12 maan mn C17C15 C19 R17 RIG CS Doc ID 16160 Rev 2 3 9 Overview STM8L15LPBOARD 2 2 1 2 2 2 3 2 4 2 5 4 9 Overview Power supply JP1 JP3 The STM8L15LP2. as interrupt input on rising edge Enter in Halt or Active Halt mode with ICC_CNT_EN low ICC_WAKEUP rising edge wakeup the MCU after 300 ms start ADC conversion as soon as possible after wakeup in order to measure the voltage corresponding to Halt mode on 1 uF capacitor C1 6 Reset the counter by programming ICC_CNT_EN High to avoid 2 Kohm to be connected later on VDD_ MCU aor oN In Halt mode the 2 K resistor is connected when T3 goes off after entering Halt mode The Q12 counter output allows connection of the 2 K resistor when the current ICC becomes very low The Halt mode measurement procedure can be used in Low power modes if the IDD current does not exceed 12 uA otherwise the Run measurement procedure must be used up to 12 mA Doc ID 16160 Rev 2 ky STM8L15LPBOARD Demonstration 3 3 1 Demonstration The jumper JP1 must be in the required position before launching the demo e if automatic consumption measurement is not used JP1 must be between pins 1 and 2 e if automatic consumption measurement is used JP1 must be between pins 2 and 3 The Wakeup button is used e to exit each mode and go to the next mode proposal e to answer no to a question and so go on to the next one The Function button is used e for specific functions as described below e to answer yes to the questions and chose the modes Select power modes After power on 2 main demonstration modes are proposed th
3. BOARD is powered by a lithium battery CR2032 when jumper JP3 is closed Depending on the JP1 position the MCU consumption auto measurement circuit can be used Table 1 JP1 setting JP1 position Description VDD power is directly connected to MCU VDD when JP1 is set as shown to the left 1 23 default setting e ojo Note For manual IDD measurement the JP1 jumper must be removed and replaced by an ammeter connected between pin 1 and 2 of JP1 123 Connect VDD power to MCU with current sampling resistor 2 ohm or 2 Kohm in eje o series for current measurement when JP1 is set as shown to the left LCD glass R26 C12 The STM8L15LPBOARD drives a 4 mux LCD glass SBLCDA2 The LCD voltage reference VLCD is shorted to VDD with a 0 ohm resistor R26 The internal LCD voltage reference embedded in the STM8L15LPBOARD can be used when R26 is removed R26 is located on the bottom side of the board A uF capacitor C12 is connected to VLCD for internal booster usage SWIM connector CN3 A SWIM connector CN3 is available for programming and debugging Buttons PCO PC1 Two buttons with wakeup interrupt capability are available FUNCTION PCO WAKEUP PC1 External quartz PC5 PC6 A 32 768 kHz quartz is connected to LSE pins PC5 and PCE It can be used either as the RTC clock or to run the CPU Doc ID 16160 Rev 2 ky STM8L15LPBOARD Overview 2 6 I O access connector CN1 The CN1 connector provi
4. des access to VDD GND RESET and 8 STM8L15LPBOARD I Os The table below gives the CN1 I O pin connections Table 2 I O connections Pin 1 0 1 VDD 2 PA1 RESET 3 PD6 4 PD7 5 PC2 6 PC3 7 PC4 8 PC7 9 PE6 10 PE7 11 22 NC 23 GND 24 NC Doc ID 16160 Rev 2 5 9 Overview STM8L15LPBOARD 2 7 6 9 MCU consumption auto measurement circuit JP1 For IDD measurement the circuit below is implemented on the STM8L15LPBOARD This circuit requires jumper JP1 to be connected between pins 2 and 3 Figure 4 IDD measurement circuit DD MC nese ei gt w ot 2 5 al 5 GND VCC ZS SN74LVCIG66DCKT a U3 SNTALVCIGOADCKT vor sf 3 r Le TTSPF20 G u R 3 ZZ CR2032 Holder e i H i _ TALV4060PW Te a a Oscillator frequency 30KHz Table 3 IDD measurement circuit pinout Signal Pin ICG Measurement PFO ICC WAKEUP on rising edge PA3 ICC_CNT_EN active low PA2 In Run mode IDD current is measured by MAX9938FEUK U1 connected to the 2 ohm shunt resistor In this case ICC_CNT_EN remains high during measurement In Halt mode the operational amplifier MAX9938FEUK U1 is connected to the 2 Kohm shunt resistor To measure a current corresponding to the Halt mode the procedure is 1 Configure ADC to measure voltage on the ICC_measurement pin Configure ICC_WAKEUP
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7. rough the LCD screen e Demonstration mode with auto measurement circuit press Function to see the consumption measurement result in each mode e Demonstration mode with manual consumption measurement 1 The first question on the LCD screen is AUTO for auto measurement circuit a If Wakeup is pressed the auto measurement circuit is not used b If Function is pressed this mode is chosen In AUTO IDD mode the MCU consumption is displayed in each chosen mode 2 The next question is RTC do you want to initialize the Real Time Clock a If Wakeup is pressed RTC is not initialized b If Function is pressed the RTC initialization procedure will start The RTC initialization procedure sets the time Start with SEC press Function until you reach the good value for the seconds then press Wakeup to go to next Then do the same for MIN and HOUR 3 The next questions are for the power mode choice a Press Function to enter the proposed mode b Press Wakeup to go to the next mode proposal If the Wakeup button is pressed after a mode has been selected the MCU is woken up and the next power mode selection is proposed To go back to the first steps of the procedure a power on is necessary Doc ID 16160 Rev 2 7 9 Revision history STM8L15LPBOARD 3 2 8 9 Mode details Table 4 Modes Mode Mode 1 Run mode at 16 MHz execution from Flash display battery voltage on LCD Press F
8. unction button to toggle between battery voltage display and time display Description Mode 2 Wait for Interrupt at 16 MHz a message is displayed on the LCD Mode 3 Low power Run Mode 4 Low power Wait Mode 5 Active halt with LCD a message is displayed on the LCD Mode 6 Active halt without LCD Mode 7 Halt no RTC nor LCD Rev 2 in this mode the RTC is disabled Power on is necessary if you wish to initialize the RTC again Revision history Table 5 Document revision history Date Revision Changes 04 Sep 2009 1 Initial release 18 Sep 2009 Section 2 7 Q13 changed to Q12 100 ms changed to 300 ms Chapter 3 removed sentence After 1 minute with no action the STM8L15LPBOARD goes into Halt mode automatically Section 3 2 mode 5 description modified Doc ID 16160 Rev 2 ky STM8L15LPBOARD Please Read Carefully Information in this document is provided solely in connection with ST products STMicroelectronics NV and its subsidiaries ST reserve the right to make changes corrections modifications or improvements to this document and the products and services described herein at any time without notice All ST products are sold pursuant to ST s terms and conditions of sale Purchasers are solely responsible for the choice selection and use of the ST products and services described herein and ST assumes no liability whatsoever
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