1FEATURES

2• Digital Calibration for Bridge Sensors

• Offset Select: Coarse and Fine

• Gain Select: Coarse and Fine

• Bridge Fault Monitor

• Input Mux for Lead Swap

• Over/Under Scale Limits

• DOUT/ VOUT Clamp Function

• Seven Banks OTP Memory

• One-Wire Digital UART Interface

• Operating Voltage: +2.7V to +5.5V

• Temperature Range: –40°C to +125°C

• MSOP-10 and 3mm × 4mm DFN-10 Packages

APPLICATIONS

• Bridge Sensors

• Remote 4-20mA Transmitters

• Strain, Load, Weigh Scales

• Automotive Sensors

EVALUATION TOOLS

• PGA308EVM (Hardware and Software)

– Calibration and Configuration

– Sensor Emulation

DESCRIPTION

The PGA308 is a programmable analog sensor signal

conditioner. The analog signal path amplifies the

sensor signal and provides digital calibration for offset

and gain. Calibration is done via the 1W pin, a digital

One-Wire, UART-compatible interface. For

three-terminal sensor modules, 1W may be

connected to VOUT and the assembly programmed

through the VOUT pin. Gain and offset calibration

parameters are stored onboard in seven banks of

one-time programmable (OTP) memory. The

power-on reset (POR) OTP bank may be

programmed a total of four times.

The all-analog signal path contains a 2×2 input

multiplexer (mux) to allow electronic sensor lead

swapping, a coarse offset adjust, an auto-zero

programmable gain instrumentation amplifier (PGA),

a fine gain adjust, a fine offset adjust, and a

programmable gain output amplifier. Fault monitor

circuitry detects and signals sensor burnout,

overload, and system fault conditions.

Over/under-scale limits provide additional means for

system level diagnostics. The dual-use DOUT/VCLAMP

pin can be used as a programmable digital output or

as a VOUT over-voltage clamp.

For detailed application information, see the PGA308

User's Guide (SBOU069) available for download at

www.ti.com.