phyCORE-OMAP44xx
Part I: PCM-049/phyCORE-OMAP44xx System on Module
L-760e_1 © PHYTEC Messtechnik GmbH 2012
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1.4.3.4 External Battery Charging
The TWL6030 PMIC can be interfaced with an auxiliary stand-alone charger device like the Texas Instruments
BQ24156A. For this purpose three control signals are available on the phyCORE-Connector X1. Please refer to
the TWL6030 data sheet for further information about the external charger IC signals and how to connect them.
The following table shows the external charger signals.
1.4.3.5 Voltage Level and Current Consumption Measuring
Besides the internal monitoring features of the TWL6030 PMIC, like thermal monitoring, the phyCORE-
OMAP44xx allows for measuring the 3.3 V main supply voltage VCC_3V3, the 1.8 V IO voltage VCC_1V8_IO and
the current consumption of the module. Thus it is possible to monitor these values in software, too.
The two voltages (VCC_3V3 and VCC_1V8_IO) can be measured by using the embedded general purpose ADCs
(GPADC2 and GPADC3) of the TWL6030 PMIC. The current consumption of the module is converted to a
proportional voltage by the Linear Technology current sense IC LT6106 (U9). The resulting voltage can be
measured by reading the value of GPADC4 of the TWL6030. The current consumption is approximately 1.357
times the voltage measured by GPADC4. Please consider, because of system measuring errors the determined
value doesn't equate exactly to the phyCORE's current consumption (measuring error ± 5%).
The GPADCs and the measured values can be read out via the I2C1 bus.
Pin #
Signal
I/O
SL
Description
X1D53
X_PMIC_EXTCHRG_ENZ
O
1.8 V
Control signal to an external VAC
charger
X1D54
X_PMIC_VAC
I
-
Input for external VAC charger
detection
X1D56
X_PMIC_CHRG_EXTCHRG_STATZ I
1.8 V
External charger status pin
Table 8:
Location of External Charger Signals
