OMAP-L137 Complementary Products

From Texas Instruments Embedded Processors Wiki

Contents 1 Introduction 2 Audio Input/Output 3 Analog-to-Digital Converters 4 Digital-to-Analog Converters 5 RS-232 6 Miscellaneous 7 Clocking 8 Power

Introduction

This page serves as a repository of Complimentary Devices that can be paired with the OMAP-L137 SoC devices when integrating the device into a system. The Complementary Products listed here serve a wide range of functions such as:

• Providing basic support functions for the SoC (power, clocking, etc.)
• Expanding the interface options beyond the on-chip peripherals
• Creating the link between the digital domains on the SoC to the system's analog/physical domains

The Complementary Products are organized into functional categories, with the goal of showing several options and their respective Benefits.

Audio Input/Output

OMAP-L137 devices include a sixteen-serializer Multi-channel Audio Serial Port (McASP) for interfacing to audio Codecs, ADCs, DACs, Digital Power Amplifiers, and more. Below is a sampling of audio Codecs that would be a good match for OMAP-L137 devices. Also view the Audio Guide for a comprehensive selection of complementary audio products.

Part Number	Description	Compatible Part Numbers	Device Interface	Details
TLV320AIC3107	Low Power Stereo CODEC with Integrated Mono Class-D Speaker Amplifiers	TLV320AIC3007	McASP	Stereo CODEC with Integrated MONO Class-D Amp Audio ADC + Audio DAC Seven Audio Input Pins
TLV320AIC3104	Low Power Stereo Audio CODEC For Portable Audio/Telephony		McASP	Stereo Audio DAC+ADC Six Audio Output Drivers Automatic Gain Control 14mW Stereo 48-kHz PB
TLV320AIC3254	Low Power Stereo Audio Codec	TLV320AIC3204	McASP	4.1 mW Stereo 48ksps DAC Playback 6.1 mW Stereo 48 ksps ADC Record Low Power Bypass

Analog-to-Digital Converters

The OMAP-L137 serial peripheral interface (SPI) can be used to interface to low-speed serial ADCs. Below is a list of ADCs compatible with OMAP-L137 devices.  Also see the Data Converter Selection Guide for a comprehensive guide to data coverter solutions from TI.

Part Number	Description	Compatible Part Numbers	Device Interface	Details
ADS7884	Single-channel, 10-bit, 3MSPS serial ADC	ADS7885	SPI	10-bit SAR ADC with sample rate of 3MSPS. ADS7885 is 8-bit version.

Digital-to-Analog Converters

The OMAP-L137 serial peripheral interface (SPI) can be used to interface to low-speed DACs. Below is a list of ADCs compatible with OMAP-L137 devices. Also see the Data Converter Selection Guide for a comprehensive guide to data coverter solutions from TI.

Part Number	Description	Compatible Part Numbers	Device Interface	Details
DAC8831	Single-channel, 16-bit, 2MSPS serial DAC	DAC8830	SPI	16-bit, 1-channel DAC with voltage output and sample rate of 2MSPS. Power consumption is 15uW at 3V. DAC8830 is a lower speed version.

RS-232

The OMAP-L137 UART peripheral can be used to implement a RS-232 interface when paired with the appropriate line driver/receiver. All three UARTs on OMAP-L137devices support transmit/receive. Additionally, UART0 supports modem control functions (CTS, RTS). Below is a sampling of RS-232 products with varying numbers of drivers/receivers to support the desired RS-232 capabilities.

Part Number	Description	Device Interface	Benefits
TRSF3232E	Two-Channel RS-232 Driver/Receiver	UART0	Adds RS-232 (with modem control) Capabilities Operates up to 1 Mbit/s ±15-kV HBM ±15-kV IEC 61000-4-2 Air-Gap Discharge ±8-kV IEC 61000-4-2 Contact Discharge Dual-channel
TRSF3221E	Single-Channel RS-232 Driver/Receiver	UART0/1/2	Adds RS-232 (without modem control) Capabilities Operates up to 1 Mbit/s ±15-kV HBM ±15-kV IEC 61000-4-2 Air-Gap Discharge ±8-kV IEC 61000-4-2 Contact Discharge Single-channel

Miscellaneous

OMAP-L137 devices include an I2C interface which can be used to communicate with off-chip peripherals like temperature sensors and touch screen controllers.  Below is a sampling of off-chip peripherals which can be used with OMAP-L137 devices.

Part Number	Description	Compatible Part Numbers	Device Interface	Details
TMP102	Low-power Digital Temperature Sensor		I2C	Low Quiescent Current 10 uA (MAX) 12-bit Resolution 10 uA (MAX) shutdown current Supply Range: 1.4V to 3.6V Accuracy: 0.5°C (–25°C to +85°C)
TCA8418 (TBA)	Keypad Scan with Integrated ESD Protection		I2C	QWERTY keyboard operation plus GPIO expansion 8x10 kepad array supported (80 buttons) Integrated ESD protection Stanby current: 3uA 1.65V to 3.6V operating supply voltage

TBA = to be announced

Clocking

OMAP-L137 devices require a 12 to 30MHz main clock. While a crystal can be paired with the internal oscillator to provide this clock, an external clock generator/synthesizer can sometimes be more cost effective. Clock generators/synthesizers can use a single crystal to produce many clock output frequencies using their internal PLLs. Not only can they source both the main clock for OMAP-L137 devices, they can also provide the clock for other devices in the system such as the audio and video encoders/decoders.

Below is a sampling of clock generators/synthesizers that would complement OMAP-L137 devices. Also view the Clocks and Timing Selection Guide for a comprehensive guide to clocking solutions from TI.

Part Number	Description	Device Interface	Details
WIP		Clock Input	WIP

Power

OMAP-L137 devices require regulated Core (1.2V) and I/O (1.8V & 3.3V) voltages, sequenced in a low-to-high order. When selecting voltage regulators to pair with OMAP-L137 devices, TI provides an OMAP-L137 Power Consumption Summary (TBD) to help size the regulators for the worst case power of the system.

In addition, TI provides a OMAP-L1x7 Power Management Website that gives detailed power specs, power reference designs covering multiple design care-abouts, and other useful links. These power reference designs are built and tested based on the worst case power specs given in the power spec table.

Below is a sampling of the power management products that complement OMAP-L1x7 devices.

Part Number	Description	Details
TPS65023	6-channel Power Mgmt IC with 3DC/DCs, 3 LDOs, I2C Interface and DVS	The TPS65023 provides the complete power needs for the OMAP-L137 in a single device
TPS62410	Dual 800mA, Adjustable, 2.25MHz Step-Down Converter with Integrated FETs & 1-Wire Interface in QFN	High Efficiency—up to 95% VIN Range From 2.5 V to 6 V Output Current 2 x 800 mA EasyScale™ Optional One Pin Serial Interface for Dynamic Output Voltage Adjustment Power Save Mode at Light Load Currents
TPS62353	3MHz DCDC Converter with Integrated FETs & I2C for Dynamic Voltage Scaling	88% Efficiency at 3-MHz Operation Output Peak Current up to 800mA Best in Class Load and Line Transient Available in a 10-Pin QFN (3 x 3 mm) 12-Pin NanoFree™ (CSP) Packaging
TPS74801	Single Output LDO, 1.5A, Adjustable Output, Programmable Soft-Start	VOUT Range: 0.8V to 3.6V 2% Accuracy Over Line/Load/Temperature Programmable Soft-Start Provides Linear Voltage Startup Stable with Any Output Capacitor ≥ 2.2uF
TPS71718	Single Output LDO, 150mA, Fixed(1.8V), High PSRR, Low Quiescent Current, Low Noise	150mA Low-Dropout Regulator with Enable Low Iq: 45µA (typical) Ultra-High PSRR: 70dB at 1kHz, 67dB at 100kHz and 45dB at 1MHz Low Noise: 30µV typical (100Hz to 100kHz) Stable with a 1.0µF Ceramic Capacitor Also Available in Fixed Output & Adjustable Output Voltage versions

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