Tegra 200 Series Developer Board User Guide
4.1.1Major Components
4.1.1.1 PMU
The Tegra 200 Series Developer Board includes a
Feature List
Host Interface
-I2C Control I/F
-Core/CPU power request signals
-32.768KHz Clock
-Reset input
-Reset output
RTC LDO
-
-Separate LDO for RTC domain allowing Deep Sleep mode support – the Tegra 250 lowest power mode
-Switch RTC domain automatically back to 1.2V when
CORE switcher
-
-CORE and RTC domains must track each other within 170mV
-Tracking can be ensured in software
-Optimized DVS handled by NVIDIA BSP (DVFS architecture)
-Turned off if CORE_PWR_REQ is
CPU switcher
-
-Optimized DVS handled by NVIDIA BSP (DVFS architecture)
-Turned off if CPU_PWR_REQ is
PLL LDO
-Use 1.1V LDO
-Very good line regulation ensured using DC/DC switcher as LDO source
STDBY input
-Standby mode: Only the minimum rails are kept powered (RTC and SYSTEM domains, DDR2 in
-The Tegra 250 indicates Standby mode by
4.1.1.2 Battery Charge Controller
The Tegra 200 Series Developer Board includes a battery charger with input current detect comparator and charge enable pin (TI bq24745). For a detailed description and list of device features, see http://focus.ti.com/lit/ds/symlink/bq24745.pdf.
4.1.1.3 Battery Pack (Not Included)
The Tegra 200 Series Developer Board can be used with a 3 cell (3S1P) Lithium ion battery pack that has a nominal voltage of
10.8volts and a total capacity of 2200mAh. The 3S1P is ideal for applications that can operate on lower voltages.
4.1.1.4 External Switchers, LDOs, Power Switches
The Tegra 200 Series Developer Board includes the following components:
Notebook System Power Controller (TI TPS51220): a dual synchronous buck regulator controller with 2 LDOs. For a detailed description and list of device features, see http://focus.ti.com/lit/ds/symlink/tps51220.pdf.
DDR2 Memory Power Supply (TI TPS51116): provides a power supply for the DDR2memory system. For a detailed description and list of device features, see http://focus.ti.com/lit/ds/symlink/tps51116.pdf.
350mA
Step Down Converter (TI TPS62290): synchronous step down
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