ST STM8L15LPBOARD User manual

September 2009 Doc ID 16160 Rev 2 1/9
UM0774
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
■Function and wakeup buttons
■32.768 kHz quartz
■MCU pins connector
Figure 1. The STM8L15LPBOARD
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Hardware layout STM8L15LPBOARD
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1 Hardware layout
Figure 2. STM8L15LPBOARD board layout: top view
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Function button
Wakeup button
ICC
auto_measurement
Supply jumper
JP3
SWIM connector
CN3
Connector CN1
jumper JP1
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STM8L15LPBOARD Hardware layout
Doc ID 16160 Rev 2 3/9
Figure 3. STM8L15LPBOARD board layout: bottom view
R26
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Overview STM8L15LPBOARD
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2 Overview
2.1 Power supply (JP1, JP3)
The STM8L15LPBOARD 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.
2.2 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 I µF capacitor C12 is connected to VLCD for internal booster usage.
2.3 SWIM connector (CN3)
A SWIM connector CN3 is available for programming and debugging.
2.4 Buttons (PC0, PC1)
Two buttons with wakeup interrupt capability are available.
2.5 External quartz (PC5, PC6)
A 32.768 kHz quartz is connected to LSE pins PC5 and PC6. It can be used either as the
RTC clock, or to run the CPU.
Table 1. JP1 setting
JP1 position Description
VDD power is directly connected to MCU VDD when JP1 is set as shown to the left
(default setting).
Note: For manual IDD measurement the JP1 jumper must be removed and replaced
by an ammeter connected between pin 1 and 2 of JP1.
Connect VDD power to MCU with current-sampling resistor (2 ohm or 2 Kohm) in
series for current measurement when JP1 is set as shown to the left.
1 2 3
1 2 3
FUNCTION: PC0
WAKEUP: PC1
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STM8L15LPBOARD Overview
Doc ID 16160 Rev 2 5/9
2.6 I/O access connector (CN1)
The CN1 connector provides 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 I/O
1VDD
2 PA1-RESET
3PD6
4PD7
5PC2
6PC3
7PC4
8PC7
9 PE6
10 PE7
11-22 NC
23 GND
24 NC
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Overview STM8L15LPBOARD
6/9 Doc ID 16160 Rev 2
2.7 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
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.
2. Configure ICC_WAKEUP as interrupt input on rising edge.
3. Enter in Halt or Active Halt mode with ICC_CNT_EN low.
4. ICC_WAKEUP rising edge wakeup the MCU after 300 ms.
5. 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.
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.
Table 3. IDD measurement circuit pinout
Signal Pin
ICC_Measurement PF0
ICC_WAKEUP (on rising edge) PA3
ICC_CNT_EN (active low) PA2
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STM8L15LPBOARD Demonstration
Doc ID 16160 Rev 2 7/9
3 Demonstration
The jumper JP1 must be in the required position before launching the demo:
●if automatic consumption measurement is not used, JP1 must be between pins 1 and
2,
●if automatic consumption measurement is used, JP1 must be between pins 2 and 3.
The Wakeup button is used:
●to exit each mode and go to the next mode proposal,
●to answer “no” to a question, and so go on to the next one.
The Function button is used:
●for specific functions as described below,
●to answer “yes” to the questions and chose the modes.
3.1 Select power modes
After power-on, 2 main demonstration modes are proposed through the LCD screen.
●Demonstration mode with auto-measurement circuit (press Function to see the
consumption measurement result in each mode).
●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.
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Revision history STM8L15LPBOARD
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3.2 Mode details
4 Revision history
Table 4. Modes
Mode Description
Mode 1 Run mode at 16 MHz, execution from Flash, display battery voltage on LCD.
Press Function button to toggle between battery voltage display and time display.
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.
Table 5. Document revision history
Date Revision Changes
04-Sep-2009 1 Initial release.
18-Sep-2009 2
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.
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STM8L15LPBOARD
Doc ID 16160 Rev 2 9/9
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