ConnectCore
f or
i.MX51
©
2011
Digi
International,
Inc.
32
Coin Cell input (VCC_COINCELL)
A connection for a coin cell or supercap is provided at VCC_COINCELL. From the coin cell the
RTC remains supplied in case of absence of the main battery. A low current 60uA charger is
included which will change the coin cell to a programmable voltage of +2.5V to +3.3V. In case
the module is turned off, it is ensured that the coin cell charge is maintained as long as a
valid main battery is in place. The behavior of the coin cell charger is programmable.
The following table shows the current draw from the coin cell when there is no main battery
attached:
The maximum voltage of the coin cell supply is +2V. The maximum voltage of the coin cell
supply is +3.6V.
Supply Outputs
The ConnectCore for i.MX51 module provides the following supply outputs:
+3.3V
+2.775V
SWBT (+5V)
+1.8V
+3.15V
+3.3V
The ConnectCore for i.MX51 module has a DC/DC converter to generate a +3.3V supply. This
supply is used on the module to power the WLAN interface, the Ethernet PHY and the
Ethernet Controller.
This power regulator can be enabled/disabled by the software to save power when the
module is in the low power modes. The maximum current provided by this regulator is 1.2A.
The current available to supply off-module components is 400mA for the wireless variants of
the ConnectCore for i.MX51, and 800mA for the wired variant of the ConnectCore for i.MX51.
+2.775V
This supply is used on the module to power the i.MX51 peripherals, the accelerometer and
the i.MX51 image processing unit. The maximum current provided by this supply is 100mA.
The current available to supply off-module components is 50mA.
SWBT (+5V)
The voltage level of the SWBT supply is +5V. The maximum current provided by this supply is
300mA.
Mode
Description
Typ
Max
Unit
RTC
All blocks disabled, no main battery
attached, coin cell is attached.
3
7
uA
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