EM MICROELECTRONIC - MARIN SA
EM8500
POWER MANAGEMENT CONTROLLER
WITH ENERGY HARVESTING INTERFACE
Features
. Flexible operation with different energy banks
. Primary cell battery
. Secondary cell battery
. Capacitors (gold-cap, super-cap)
. Ultra-low power DCDC boost converter with very high efficiency
. Operating mode minimum voltage VDD_HRV ≥ 100 mV (typical)
. Operating mode minimum power: PIN ≥ 1µW (typical)
. Quiescent current: IQ ≤ 125 nA
. Cold-start minimum voltage: VIN ≥ 300 mV
. Cold-start minimum power: PIN ≥ 3 µW (typical)
. Fast start-up on any energy storage
. Dual energy storage elements
. Power management control
. Multiple independent supply outputs
. Sleep mode and wake-up functions
. User programmable under-voltage and over-voltage levels
. Limited external components
. Device configurations are stored in on-chip E2PROM
. Dynamic configuration through a SPI or I2C interface
. Extended power management status
. Battery on protection mode
. LTS/STS connection status
. Minimum/Maximum voltage warning
Description
The EM8500 is an integrated power management solution for low
power applications. It is specifically designed for efficient operation
with a variety of DC harvesting sources including thermal electric
generators (TEG) or photovoltaic (solar) sources in the μW to mW
range.
The device is designed to speed-up system start-up time when the
main energy storage element (aka Long Term Storage – LTS) is
completely discharged or insufficiently charged to supply the
application, by using a secondary energy storage element (Short
Term Storage - STS).
. USB connected
Applications
. Energy harvesting equipped platforms
. Solar charging
. Thermo-electrical generator harvesting (TEG)
. Wearable systems
. Beacons and wireless sensor networks
. Industrial and environmental monitoring
. Battery operated platforms
When using a non-rechargeable primary battery the EM8500's on-
board PMU offers a mechanism to extend battery life when assisted
by a harvesting element.
The EM8500 incorporates a boost converter able to start with an
input voltage as low as 300 mV and an input power of few μW.
In functional mode the EM8500 operates at energy levels from a DC
harvesting source as low as 100 mV and 1 μW. To maximize
24 Lead MLF
4x4mm body
harvesting efficiency the EM8500 integrates
maximum power point tracking controller.
a programmable
The EM8500 is capable of working with a variety of energy elements
as secondary storage, namely re-chargeable batteries, super-
capacitors or conventional capacitors. In all cases the EM8500
maintains its fast start-up capability that depends only on the
harvester conditions and the STS capacitor value.
24
23
22
21
20
19
1
2
3
4
5
6
18
17
16
15
14
13
VDD_STS
WAKE_UP
VDD_USB
MOSI_SDA
MISO
BAT_LOW
HRV_LOW
VSUP
A USB connection to an external power source is available on the
EM8500 for fast charge of the long term storage element.
EM8500
N.C.
The EM8500 integrates voltage supervisory functions. Minimum and
maximum voltages are controlled on the LTS element to prevent
damage to the energy storage element. Harvester minimum voltage
monitoring allows stopping the DCDC limiting power loss when no
energy can be harvested. Output voltages are kept in a safe range
for the application.
VAUX[2]
VAUX[1]
SCL
7
8
9
10
11
12
To perform granular power management of the application, the
EM8500 integrates four independent supply outputs and a sleep
mode offering the capability to switch off part or all the supplies.
The EM8500 is available in an industry standard QFN24 4x4 package
or as a solder bump flip-chip device.
Figure 1-1 QFN24 Package
1
www.emmicroelectronic.com
Copyright 2017, EM Microelectronic-Marin SA
8500-DS, Version 2.1, 24-May-17
420005-A01, 2.0
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