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EM8500 Datasheet(PDF) 21 Page - EM Microelectronic - MARIN SA

Part # EM8500
Description  POWER MANAGEMENT CONTROLLER WITH ENERGY HARVESTING INTERFACE
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Manufacturer  EMMICRO [EM Microelectronic - MARIN SA]
Direct Link  http://www.emmicroelectronic.com
Logo EMMICRO - EM Microelectronic - MARIN SA

EM8500 Datasheet(HTML) 21 Page - EM Microelectronic - MARIN SA

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EM8500
Copyright
2017, EM Microelectronic-Marin SA
8500-DS, Version 2.1, 24-May-17
21
www.emmicroelectronic.com
420005-A01, 2.0
Register name: reg_lux_meter_result
Address: 0x1D
Bits
Bit name
Type
Reset
Description
7:5
'000'
Reserved
4
lux_meter_busy
RO
0
Indicates that the lux-meter is still searching for best range
3:0
lux_meter_result
RO
0x0
Lux-meter range status (result in automatic measurement mode)
"0000" (0x0)
below 2 µA
"0001" (0x1)
from 2 µA to 4 µA
"0010" (0x2)
from 4 µA to 8 µA
"0011" (0x3)
from 8 µA to 15 µA
"0100" (0x4)
from 15 µA to 30 µA
"0101" (0x5)
from 30 µA to 60 µA
"0110" (0x6)
from 60 µA to 120 µA
"0111" (0x7)
from 120 µA to 0.25 mA
"1000" (0x8)
from 0.25 mA to 0.5 mA
"1001" (0x9)
from 0.5 mA to 1 mA
"1010" (0xA)
from 1 mA to 1.8 mA
"1011" (0xB)
from 1.8 mA to 3.2 mA
"1100" (0xC)
from 3.2 mA to 6 mA
"1101" (0xD)
from 6 mA to 11 mA
"1110" (0xE)
from 11 mA to 17 mA
"1111" (0xF)
above 17 mA
Table 5-19 Lux-meter Result Register (0x1D)
5.7.
USB CHARGING
The EM8500 is equipped with a USB power line input to supply the device and to charge has the energy bank elements.
When a voltage above Vusb_min is detected, a regulator between VDD_USB and VDD_STS is enabled. The regulated voltage is VUSB_REG. In addition
to the regulator, a current source is activated between VDD_USB and VDD_LTS. This function is controlled by the reg_ext_cfg register. Four user
selected level of charge current delivered to LTS are available (reg_ext_cfg.usb_crt_src_sel).
When VDD_USB is connected, pins HRV_LOW and BAT_LOW can be brought into HiZ state.
Register name: reg_ext_cfg
Address: 0x13
Default value mapped in E2PROM
Bits
Bit name
Type
Description
7
sda_slopectrl
RW
6
wake_up_deb_en
RW
5:4
wake_up_edge_cfg
RW
3
usb_frc_hrv_low_hiz
RW
‘1’ force HRV_LOW in Hi-Z state if usb_on = '1'
‘0’ HRV_LOW pin standard configuration
2
usb_frc_bat_low_hiz
RW
‘1’ force BAT_LOW in Hi-Z state if usb_on = '1'
‘0’ BAT_LOW pin standard configuration
1:0
usb_crt_src_sel
RW
USB power current source selection
"00" (0x0)
0 mA
(do not charge)
"01" (0x1)
5 mA
"10" (0x2)
10 mA
"11" (0x3)
20 mA
Table 5-20 USB Configuration Register (0x13)
Warning: When VDD_LTS is to be disconnected from its load, the USB current injected into LTS must be set to 0 mA, otherwise the device
could be damaged.
5.8.
MISCELLANEOUS FUNCTIONS
This chapter describes additional control functions related to the regulation loop.
5.8.1.
SOFT RESET FUNCTION
The soft reset function restarts the EM8500 from its boot sequence. The behavior of the EM8500 is the same as in a normal boot sequence. A
soft reset is generated by setting the register reg_soft_res_word to 0xAB. This register is enabled only if reg_protect_key is set to 0xE2. If the
value of the reg_protect_key is different from 0xE2, the register reg_soft_res_word is set to 0x00.
The reg_protect_key register is reset by the soft reset. Creating a new soft sequence requires preloading the reg_protect_key again.


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