Swatch EM Microelectronic EM8500 Series User manual

USER GUIDE ƖEM8500 SERIES
Copyright 2016, EM Microelectronic-Marin SA
EMEVB8500-MN01, Version 2.0, 5-Jul-16
1
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420005-A01, 3.0
EMEVB8500 EVALUATION BOARD USER GUIDE
TABLE OF CONTENTS
1INTRODUCTION ..............................................................................................................................................................2
2MAIN FEATURES.............................................................................................................................................................2
3OVERVIEW .....................................................................................................................................................................3
4EMEVB8500 BOARD .......................................................................................................................................................5
4.1 DESCRIPTION ...............................................................................................................................................................5
4.2 FEATURES DESCRIPTION..................................................................................................................................................7
4.3 GOOD PRACTICES AND RECOMMENDATIONS.....................................................................................................................13
4.4 SCHEMATIC................................................................................................................................................................14
4.5 BOM .......................................................................................................................................................................15
5LIST OF FIGURES ........................................................................................................................................................... 16
6LIST OF TABLES .............................................................................................................................................................16
EM MICROELECTRONIC - MARIN SA

USER GUIDE ƖEM8500 SERIES
Copyright 2016, EM Microelectronic-Marin SA
EMEVB8500-MN01, Version 2.0, 5-Jul-16
2
www.emmicroelectronic.com
420005-A01, 3.0
1 INTRODUCTION
The EMEVB8500 board is targeted at rapid evaluation and prototyping of integrated energy harvesting solutions based on
EM8500 series of devices. The evaluation board offers a set of features to show the performance of EM8500 hardware
applications.
The EMEVB8500 board allows flexibility with various configuration, external harvester input, internal or external storage
elements and user connections.
2 MAIN FEATURES
Hardware
ƖLong Term storage selection (on-board
Supercap or external)
ƖSupercap discharge path
ƖShort term storage selection (on-board capacitor
or external)
ƖExternal harvester selection
ƖExpansion header for prototyping and external
connection
ƖConfigurable wake-up line with push-button
ƖEM8500 series I2C pull-up selection
Software
ƖEMPB85xx Software is available when the
configuration tool EMPB85xx is used.
Refer to EMPB85xx User Manual.

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3 OVERVIEW
The EMEVB8500 exists in different variants to support each device of the EM8500 series. In this document without specific
description the name 8500 applies for any members of the EM8500 series. Some particular description refers to specific
parts (e.g: EM8500, EM8502,…).
The architecture of the EMEVB8500 is based on the following block diagram
EM8500
LX1
VDD_HRV
I2C - SPI
VDD_USB
WAKE_UP
VDD_LTS
VDD_STS
VAUX2
VAUX1
VAUX0
VSUP
STS
User
HRV
BAT_LOW
HRV_LOW
J1
S1 J2A
J3
User
LTS
S2
J2B Supercap
STS
User
STS
S3
VAUX_GND2
VAUX_GND1
VAUX_GND0
H1
Supply
STS
H2
Com
Ctrl
I2C pull
J6A-J6B
WAKE-UP
CONFiG
Push-button
JA4-J4B
J5A-J5B
Miscs
H3
User
STS
VSS
VSS_DCDC
User extension connector User extension screw terminal block Configuration area
Figure 3-1 EMEVB8500 System Architecture for EM8500

USER GUIDE ƖEM8500 SERIES
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EM8502
VDD_SOL
I2C - SPI
VDD_USB
WAKE_UP
VDD_LTS
VDD_STS
VAUX2
VAUX1
VAUX0
VSUP
STS
User
HRV
BAT_LOW
HRV_LOW
J1
S1 J2A
J3
User
LTS
S2
J2B Supercap
STS
User
STS
S3
VAUX_GND2
VAUX_GND1
VAUX_GND0
H1
Supply
STS
H2
Com
Ctrl
I2C pull
J6A-J6B
WAKE-UP
CONFiG
Push-button
JA4-J4B
J5A-J5B
Miscs
H3
User
STS
VSS
VSS2
User extension connector User extension screw terminal block Configuration area
Figure 3-2 EMEVB8500 System Architecture for EM8502

USER GUIDE ƖEM8500 SERIES
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4 EMEVB8500 BOARD
4.1 DESCRIPTION
The board for EM8500 variant is equipped with:
ƖEM8500 core design consisting of the EM8500 devices and required external components.
ƖExtension header (H1) used to supply the application
ƖExtension header (H2) used to interface the communication and control signals between application and
EM8500.
ƖExtension header (H3) used to expose other signals (STS, LTS, HRV, USB ...)
ƖExtension header (PRG) used to configure the EM8500
ƖTerminal block (S1) to connect any external harvester
ƖTerminal block (S2) to connect an external Long Term Storage to LTS (primary or secondary storage)
ƖTerminal block (S3) to connect an external Short Term Storage to STS
ƖSupercap (SC) as LTS with a dedicated discharge path
ƖDifferent jumper areas to select the terminal blocks or internal board resources and configure I2C lines or
Wake-up line
ƖPush button (K2) used for the Supercap discharging
ƖPolarity configurable push button (K1) used for Wake-up control line.
The board for EM8502 variant is equipped with:
ƖEM8502 core design consisting of the EM8502 devices and required external components.
ƖSame as EM8500 variant
The board dimension is 65 x 65 mm.
H1, H2 and H3 are male headers 2x10 pins (2.54 mm pitch).
PRG is male headers 2x4 pins (2.54 mm pitch).
S1, S2 and S3 are 2 pins screw terminal block (3.5 mm pitch).

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H1
1,2 VSS
3,4 VSUP
5,6 VAUX_2
7,8 VAUX_1
9,10 VAUX_0
11,12 VSS
13,14 VAUX_GND_0
15,16 VAUX_GND_1
17,18 VAUX_GND_2
19,20 VSS
Place jumper on
J1 to connect
the external
Harvester (S1)
B
H2
1,2 VSS
3,4 CS
5,6 SCL (SCK)
7,8 MISO (SDO)
9,10 MOSI_SDA (SDI)
11,12 WAKE_UP
13,14 BAT_LOW
15,16 HRV_LOW
17,18 VSUP
19,20 VSS
H3
1,2 VSS
3,4 AVDD_STS
5,6 VSS
7,8 AVDD_LTS
9,10 VSS
11,12 AVDD_USB
13,14 AVDD_REG
15,16 AVDD_HRV
17,18 VSS
19,20 VSS
PRG 8500
1VSS
2CS
3 VSUP
4 SCL
5 AVDD_STS
6 MISO
7 WAKE_UP
8 MOSI_SDA
Place jumper on J2A
to connect the
external LTS (S2)
Place jumper on J2B
to connect the
internal LTS
Supercap (SC)
Press K2 for
Supercap (SC)
safe discharge
K2
S1 –J1
S2 –SC –J2A –J2B
Place jumper on
J3 to connect
the external
STS (S3)
S3 –J3
I2C - J6A –J6B
Place jumpers on
J6A and J6B to
add pull-ups on
SDA and SCK
Configuration for Wake-up
button (K1) - rising edge
Configuration for Wake-up
button (K1) - falling edge
Configuration for Wake-up
pull-down
Configuration for Wake-up
pull-up
WAKE-UP
Figure 4-1: EMEVB8500 Description

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4.2 FEATURES DESCRIPTION
4.2.1 H1 extension connector
H1 connects the supply lines VSUP, VAUX and VAUX_GND lines to the application
I/O TYPE
DESCRIPTION
NO.
PIN NAME
DIRECTION(*)
SUPPLY
1
VSS
Supply
System ground connection (EM8500 series ground)
2
VSS
Supply
System ground connection (EM8500 series ground)
3
VSUP
Output
Main supply
4
VSUP
Output
Main supply
5
VAUX[2]
Output
Auxiliary 2 supply connection
6
VAUX[2]
Output
Auxiliary 2 supply connection
7
VAUX[1]
Output
Auxiliary 1 supply connection
8
VAUX[1]
Output
Auxiliary 1 supply connection
9
VAUX[0]
Output
Auxiliary 0 supply connection
10
VAUX[0]
Output
Auxiliary 0 supply connection
11
VSS
Supply
System ground connection (EM8500 series ground)
12
VSS
Supply
System ground connection (EM8500 series ground)
13
VAUX_GND[0]
Output
Auxiliary 0 ground supply connection
14
VAUX_GND[0]
Supply
Auxiliary 0 ground supply connection
15
VAUX_GND[1]
Output
Auxiliary 1 ground supply connection
16
VAUX_GND[1]
Output
Auxiliary 1 ground supply connection
17
VAUX_GND[2]
Output
Auxiliary 2 ground supply connection
18
VAUX_GND[2]
Output
Auxiliary 2 ground supply connection
19
VSS
Supply
System ground connection (EM8500 series ground)
20
VSS
Supply
System ground connection (EM8500 series ground)
Table 4-1 H1 Pin-out description

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4.2.2 H2 extension connector
H2 connects the SPI/I2C communication lines and BT_LOW and HRV_LOW control lines
I/O TYPE
DESCRIPTION
NO.
PIN NAME
DIRECTION(*)
SUPPLY
1
VSS
Supply
System ground connection (EM8500 series ground)
2
VSS
Supply
System ground connection (EM8500 series ground)
3
CS
Input
VSUP
SPI chip select and SPI/I2C selection mode (when at
‘1’)
4
CS
Input
VSUP
SPI chip select and SPI/I2C selection mode (when at
‘1’)
5
SCL(SCK)
Input
VSUP
I2C/SPI clock connection
6
SCL(SCK)
Input
VSUP
I2C/SPI clock connection
7
MISO
(SDO)
Output
VSUP
SPI MISO data connection
8
MISO
(SDO)
Output
VSUP
SPI MISO data connection
9
MOSI
(SDA)
Input
(Inout)
VSUP
SPI MOSI input (SDA I2C inout) data connection
10
MOSI
(SDA)
Input
(Inout)
VSUP
SPI MOSI input (SDA I2C inout) data connection
11
WAKE_UP
Input
All
(STS)
Wake-up pin
12
WAKE_UP
Input
All
(STS)
Wake-up pin
13
BAT_LOW
Output
VSUP
Battery low indicator (when at ‘1’)
14
BAT_LOW
Output
VSUP
Battery low indicator (when at ‘1’)
15
HRV_LOW
Output
VSUP
Energy harvester cell low indicator (when at ‘1’)
16
HRV_LOW
Output
VSUP
Energy harvester cell low indicator (when at ‘1’)
17
VSUP
Output
Main supply
18
VSUP
Output
Main supply
19
VSS
Supply
System ground connection (EM8500 series ground)
20
VSS
Supply
System ground connection (EM8500 series ground)
Table 4-2 H1 Pin-out Description

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4.2.3 H3 extension connector
H3 connects/monitors several other signals
I/O TYPE
DESCRIPTION
NO.
PIN NAME
DIRECTION(*)
SUPPLY
1
VSS
Supply
System ground connection (EM8500 series ground)
2
VSS
Supply
System ground connection (EM8500 series ground)
3
VDD_STS
I/O
Connection for the Short Term energy Storage
element
4
VDD_STS
I/O
Connection for the Short Term energy Storage
element
5
VSS
Supply
System ground connection (EM8500 series ground)
6
VSS
Supply
System ground connection (EM8500 series ground)
7
VDD_LTS
I/O
Connection for the Long Term energy Storage
element
8
VDD_LTS
I/O
Connection for the Long Term energy Storage
element
9
VSS
Supply
System ground connection (EM8500 series ground)
10
VSS
Supply
System ground connection (EM8500 series ground)
11
VDD_USB
Input
USB power supply connection
12
VDD_USB
Input
USB power supply connection
13
VREG
Output
Regulated voltage connection
14
VREG
Output
Regulated voltage connection
15
VDD_HRV
(VDD_SOL)
Input
Connection for energy harvester
16
VDD_HRV
(VDD_SOL)
Input
Connection for energy harvester
17
VSS
Supply
System ground connection (EM8500 series ground)
18
VSS
Supply
System ground connection (EM8500 series ground)
19
VSS
Supply
System ground connection (EM8500 series ground)
20
VSS
Supply
System ground connection (EM8500 series ground)
Table 4-3 H3 Pin-out Description
4.2.4 PRG extension connector
A dedicated connector is available to access all required lines used to configure the EM8500 series
(EEPROM or access to registers).
The communications (SPI/I2C) lines are also available on the H2 extension connector (for the
application). To avoid conflicts, the connections to the application should be disconnected during
accesses through PRG.
I/O TYPE
DESCRIPTION
NO.
PIN NAME
DIRECTION(*)
SUPPLY
1
VSS
Supply
System ground connection (EM8500 series ground)
2
CS
Input
VSUP
SPI chip select and SPI/I2C selection mode (when at
‘1’)
3
VSUP
Output
Main supply
4
SCL(SCK)
Input
VSUP
I2C/SPI clock connection
5
VDD_STS
I/O
Connection for the Short Term energy Storage
element
6
MISO
(SDO)
Output
VSUP
SPI MISO data connection
7
WAKE_UP
Input
All
(STS)
Wake-up pin
8
MOSI
(SDA)
Input
(Inout)
VSUP
SPI MOSI input (SDA I2C inout) data connection
Table 4-4 PRG Pin-out Description

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4.2.5 S1 terminaL and HRV
An external harvester can beconnected to the S1 screw block terminal. To connect the external harvester
to the VDD_HRV pin of the EM8500 (VDD_SOL pin of the EM8502), a jumper must be placed on J1.
Figure 4-2: EMEVB8500 HRV & S1 View
Notes:
(1) There is no default on-board harvester available.
(2) Observe polarity when connecting the input external harvester. Reverse polarity generates
high leakage current across the EM8500 series ESD protection diode connected to VSS.
4.2.6 S2 terminal and LTS
The external Long Term Storage can be connected to the S2 screw block terminal. To connect the
external Long Term Storage to the VDD_LTS pin of the EM8500 series, a jumper must be placed on J2A
(Jumper on J2B must be removed).
Figure 4-3: EMEVB8500 LTS, S2 & K2 View
Notes:
(1) A default on board LTS capacitor C7 (10uF) is connected on VDD_LTS. This capacitor cannot be
disconnected except by physically removing it.
(2) When using the on-board Supercap (SC) as Long Term Storage a jumper on J2B must be placed
(Jumper on J2A must be removed).
(3) A dedicated Supercap discharge circuit is available on board. To ensure that the on board Supercap
is correctly discharged, keep button K2 pressed for at least 15 seconds.
(4) Observe polarity when connecting the external Long Term Storage. Reverse polarity
generates high leakage across the EM8500 series ESD protection diode connected to VSS
and may damage the LTS. When using a battery, do not connect battery with reversed
polarity.

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4.2.7 S3 terminaL and STS
The external Short Term Storage can be connected to the S3 screw block terminal. To connect the
external Short Term Storage to the VDD_STS pin of the EM8500 series, a jumper must be placed on J3.
Figure 4-4: EMEVB8500 STS & S3 View
Notes:
(1) A default on-board STS capacitor C6 (100uF) is connected on VDD_STS. This capacitor cannot be
disconnected except by physically removing it.
(2) Observe polarity when connecting the external Short Term Storage. Reverse polarity
generates high leakage across the EM8500 series ESD protection diodes connected to VSS
and may damage the device.

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4.2.8 WAKE-UP control line
The WAKE_UP pin of the EM8500 series is available for external connection or can be driven by push
button K1.
Its configuration is determined by jumpers J4A, J4B, J5A and J5B.
EM8500
WAKE_UP
Configuration for Wake-up
button (K1) - rising edge
Configuration for Wake-up
button (K1) - falling edge
Configuration for Wake-up
pull-down
Configuration for Wake-up
pull-up
VDD_STS
VSS
1M
EM8500
WAKE_UP
VDD_STS
VSS
1M
EM8500
WAKE_UP
VSS
1M
EM8500
WAKE_UP
VDD_STS
1M
Configuration for Wake-up
floating
EM8500
WAKE_UP
VDD_STS
Figure 4-5: EMEVB8500 WAKE-UP multiple Configuration Examples

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4.2.9 I2C lines configuration
The I2C communication pins (SCL and MOSI_SDA) do not incorporate internal pull-ups. It is possible to
add external 10Kohms pull-ups resistors (R2 and R3) by adding jumpers on J6A and JPB.
Figure 4-6: EMEVB8500 I2C Pull-ups Configuration
4.3 GOOD PRACTICES AND RECOMMENDATIONS
Find below a check-list of common recommendations that should not be overlooked
CS Line
When using I2C communication, ensure that the CS line is kept low (either use a pull-down resistor on CS or tied
directly to ground).
If CS is floating the SPI bus might erroneously be selected instead of the I2C and I2C communication cannot be
established.
Communication Lines
When using EM8500 series without a microcontroller or other hardware to control the communication lines, the
floating lines (and their respective input buffers) might consume significant energy which may reduce the efficiency
of your system (especially when the harvester source provides low levels of energy). Keep the MOSI (SDA),
SCl(SCK) and CS lines to defined levels (no floating lines). Use pull resistors or direct connection to a well-defined
level (‘0’ or ‘1’)
Note: Depending on your WAKE-UP configuration, also apply the same rule for WAKE-UP line.

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4.4 SCHEMATIC
Figure 4-7: EMEVB8500 Schematic
Note: The schematics for EM8500 and EM8502 devices are based on Figure 4-7: EMEVB8500 Schematic. The
differences for each variant are listed in the

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Table 4-5 EMEVB8500 schematic variant
Schematic Name
EM8500 Variant
EM8502 Variant
L1
Coil 47uH
Resistor 0 ohm
EM8500 Symbol –pin name VDD_HRV
Pin name VDD_HRV
No Connect pin
EM8500 Symbol –pin name LX1
Pin name LX1
Pin name VDD_SOL
EM8500 Symbol –pin name VSS_DCDC
Pin name VSS_DCDC
Pin name VSS2
EM8500 Symbol
EM8500 device
EM8502 device
Table 4-5 EMEVB8500 schematic variant description
4.5 BOM
Designator
Part Description
C1,C2,C3,C4
Capacitor SMD 2012 1uF
C5
Capacitor SMD 2012 470nF
C6
Capacitor SMD 3216 100uF
C7,C8
Capacitor SMD 2012 10uF
EM8500
EM8500 harvester controller QFN24 (EM8500 variant)
EM8502 harvester controller QFN24 (EM8502 variant)
H1,H2,H3
Header 2x10 2.54mm
J1,J2A,J2B,J3,J4A,J4B,J5A,J6A,J6B
Jumper 2.54mm
K1,K2
Button C&K KSR211GLFS
L1
Coil 47uH TDK VLS3012ET-470M (EM8500 variant)
Resistor SMD 3216 0 (EM8502 variant)
PRG
Header 2x4 2.54mm
R1
Resistor SMD 2012 1M
R2,R3
Resistor SMD 2012 10K
R4
Resistor SMD 3216 22
S1,S2,S3
Screw Terminal TE Connectivity 1776275-2
SC
Supercap Kemet FC0H104ZFTBR24 0.1F
Table 4-6 Bill of Material

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5 LIST OF FIGURES
Figure 1-1 EMEVB8500 System Architecture for EM8500 ....................................................................................................................................3
Figure 1-2 EMEVB8500 System Architecture for EM8502 ....................................................................................................................................4
Figure 2-1: EMEVB8500 Description..............................................................................................................................................................6
Figure 2-2: EMEVB8500 HRV & S1 View.....................................................................................................................................................10
Figure 2-3: EMEVB8500 LTS, S2 & K2 View...............................................................................................................................................10
Figure 2-4: EMEVB8500 STS & S3 View .....................................................................................................................................................11
Figure 2-5: EMEVB8500 WAKE-UP multiple Configuration Examples ....................................................................................................12
Figure 2-6: EMEVB8500 I2C Pull-ups Configuration.................................................................................................................................13
Figure 2-7: EMEVB8500 Schematic .............................................................................................................................................................14
6 LIST OF TABLES
Table 2-1 H1 Pin-out description....................................................................................................................................................................7
Table 2-2 H1 Pin-out Description ...................................................................................................................................................................8
Table 2-3 H3 Pin-out Description ...................................................................................................................................................................9
Table 2-4 PRG Pin-out Description.................................................................................................................................................................9
Table 2-5 EMEVB8500 schematic variant description .............................................................................................................................15
Table 2-6 Bill of Material ..............................................................................................................................................................................15
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