MS5540C

Miniature Barometer Module

09/2015

Page 4

RECOMMENDED OPERATING CONDITIONS

Parameter

Symbol

Conditions

Min

Typ

Max

Unit

Operating pressure range

p

10

1100

mbar

abs.

Supply voltage

2.2

3.0

3.6

V

Supply current,

average (1)

during conversion (2)

standby (no conversion)

4

1

0.1

µA

mA

µA

Current consumption into MCLK

(3)

MCLK = 32.768 kHz

0.5

µA

Operating temperature range

T

-40

+85

°C

Conversion time

MCLK = 32.768 kHz

35

ms

External clock signal (4)

MCLK

30.000

32.768

35.000

kHz

Duty cycle of MCLK

40/60

50/50

60/40

%

Serial data clock

SCLK

500

kHz

NOTES

1) Under the assumption of one conversion every second. Conversion means either a pressure or a temperature

measurement started by a command to the serial interface of MS5540C.

2) During conversion the sensor will be switched on and off in order to reduce power consumption; the total on

time within a conversion is about 2 ms.

3) This value can be reduced by switching off MCLK while MS5540C is in standby mode.

4) It is strongly recommended that a crystal oscillator be used because the device is sensitive to clock jitter. A

square-wave form of the clock signal is a must.