DA5540C_003

June 16th, 2008

1

0005540C1193 ECN 1118

MS5540C (RoHS

•

10 - 1100 mbar absolute pressure range

•

6 coefficients for software compensation stored

on-chip

•

Piezoresistive silicon micromachined sensor

•

Integrated miniature pressure sensor 6.2 x 6.4 mm

•

16 Bit ADC

•

3-wire serial interface

•

1 system clock line (32.768 kHz)

•

Low voltage and low power consumption

•

RoHS-compatible & Pb-free*

DESCRIPTION

The MS5540C is a SMD-hybrid device including a precision piezoresistive pressure sensor and an ADC-

Interface IC. It is a miniature version of the MS5534C barometer/altimeter module and provides a 16 Bit data

word from a pressure and temperature dependent voltage. MS5540C is a low power, low voltage device with

automatic power down (ON/OFF) switching. A 3-wire interface is used for all communications with a micro-

controller.

Compared to MS5534A the pressure range (measurement down to 10 mbar) has been improved. The MS5540C

is fully software compatible to the MS5534C and previous versions of MS5540. In addition, the MS5540C is from

its outer dimensions compatible to the MS54XX series of pressure sensors. Compared to the previous version

the ESD sensitivity level has been improved to 4kV on all pins. The gel protection of the sensor provides a water

protection sufficient for 100 m waterproof watches without any additional protection.

FEATURES

APPLICATIONS

•

Resolution 0.1 mbar

•

Mobile altimeter/barometer systems

•

Supply voltage 2.2 V to 3.6 V

•

Weather control systems

•

Low supply current < 5 µA

•

Adventure or multi-mode watches

•

Standby current < 0.1 µA

•

GPS receivers

•

-40°C to +85°C operation temperature

•

No external components required

BLOCK DIAGRAM

VDD

GND

MCLK

SCLK

DOUT

DIN

Input MUX

ADC

Digital

Interface

Memory

(PROM)

64 bits

SENSOR

SGND

+IN

-IN

dig.

Filter

Sensor

Interface IC

Fig. 1: Block diagram MS5540C.

bans the use of lead, mercury, cadmium, hexavalent chromium and polybrominated biphenyls (PBB) or polybrominated diphenyl ethers

(PBDE).