原创 TI TPS65950电源和CODEC方案(TPS65950)

 2008-12-17 16:32  3010 4 4 分类: 模拟

TI 公司的TPS65950是高度集成的电源管理和音频CODEC集成电路,支持OMPA应用处理器的电源和外设规范.器件包括了电源管理,音频编译码器(CODEC),USB高速收发器,ac/USB充电器,LED驱动器,ADC,RTC和嵌入功率控制.本文介绍了TPS65950各部分的主要特性,方框图以及典型应用电路.

The TPS65950 device is a highly integrated power-management and audio coder/decoder (codec) integrated circuit (IC) that supports the power and peripheral requirements of the OMAP application processors. The device contains power management, an audio codec, a universal serial bus (USB) high-speed (HS) transceiver, an ac/USB charger, light-emitting diode (LED) drivers, an analog-to-digital converter (ADC), a real-time clock (RTC), and embedded power control.

The power portion of the device contains three buck converters, two controllable by a dedicated SmartReflex class-3 interface, multiple low-dropout (LDO) regulators, an embedded power controller (EPC) to manage the power-sequencing requirements of OMAP, and an RTC and backup module. The RTC can be powered by a backup battery when the main supply is not present, and the device contains a coin-cell charter to recharge the backup battery as needed.

The USB module provides a HS 2.0 on-the-go (OTG) transceiver suitable for direct connection to the OMAP universal transceiver macrocell interface (UTMI) + low pin interface (ULPI) with an integrated charge pump (CP) and full support for the carkit Consumer Electronics Association (CEA)-936A specification.

The Li-ion battery charger supports charging from ac chargers, USB host devices, USB chargers, or carkits. The type of charger is detected automatically by the device, which provides hardware-controlled linear charging with ac chargers, USB chargers, and carkits, in addition to software-controlled charging for all charger types.

The audio codec in the device includes five digital-to-analog converters (DACs) and two ADCs to provide multiple voice channels and stereo downlink channels that can support all standard audio sample rates through several inter-IC sound (I2S)/time division multiplexing (TDM) format interfaces. The audio output stages on the device include stereo headset amplifiers, two integrated class-D amplifiers providing stereo differential outputs, predrivers for line outputs, and an earpiece amplifier. The input audio stages include three differential microphone inputs, stereo line inputs, and interface for digital micrphones. Automatic and programmable gain control is available with all necessary digital filtering, side-tone functions, and pop-noise reduction.

The device also provides a auxiliary modules, including LED drivers, and ADC, keypad interface, and general-purpose inputs/outputs (GPIOs). The LED driver can power two LED circuits to illuminate a panel or provide user indicators. The drivers also provide pulse width modulation (PWM) circuits to control the illumination levels of the LEDs. The ADC monitors signals entering the device, such as supply and charging voltages, and has multiple additional external ADC inputs for system use. The keypad interface implements a built-in scanning algorithm to decode hardware-based key presses and to reduce software use, with multiple additional GPIOs that can be used as interrupts when they are configured as inputs.

TPS65950主要特性:

电源:
Three efficient stepdown converters
10 external linear LDOs for clocks and peripherals
SmartReflex dynamic voltage management
音频:

Voice codec
15-bit linear codec (8 and 16 kHz)
Differential input main and submicrophones
Differential headset microphone input
Auxiliary/FM input (mono or stereo)
Differential 32-Ω speaker and 16-Ω headset drivers (external predrivers for class D)
8-Ω stereo class-D drivers
Pulse code modulation (PCM) and TDM interfaces
Bluetooth interface
Automatic level control (ALC)
Digital and analog mixing
16-bit linear audio stereo DAC (96, 48, 44.1, and 32 kHz, and derivatives)
16-bit linear audio stereo ADC (48, 44.1, and 32 kHz, and derivatives)
Digital microphone inputs
Carkit
Charger:
Li-ion, Li-on polymer, and cobalt-nickel-manganese charger
Supports charging with ac-regulated charger (maximum 7 V), USB host devices, Mobile Computing Promotion Consortium (MCPC) devices, USB chargers, and carkit chargers (maximum 7 V)
Backup battery charger
USB:
USB 2.0 OTG-compliant HS transceivers
12-bit ULPI
USB power supply (5-V CP for VBUS)
CEA-2011: OTG transceiver interface specification
CEA-936A: Mini-USB analog carkit interface specification
MCPC ME-universal asynchronous receiver/transmitter (UART) GL-006 specification
Additional features:
LED driver circuit for two external LEDs
10-bit MADC with 3 to 8 external inputs
RTC and retention modules
HS inter-integrated circuit (I2C™) serial control
Thermal shutdown and hot-die detection
Keypad interface (up to 8 × 8)
External vibrator (vibrator) control
19 GPIO devices
0.4-mm pitch, 209 pin, 7 × 7 mm package