User's Manual

2.3 Power consumption

As a DC/DC voltage regulator is integrated, the current consumption is strongly

depending on the supplied voltage level.

The transmit and receive currents are depending on the impedance matching,

and therefore may vary depending on antenna selection and matching.

The indicated values are the complete current consumption for radio and ac-

tive MCU. Not to be confused with only radio or only CPU core currents, as

sometimes stated by others.

A stable power supply is indispensable to ensure valid operating conditions for

the module.

2.3.1 Static

The current consumption is the sum of the CPU current and Radio TX or RX current in

active modes. Measurements on Themisto-I-EV with T=25°C, VDDS=3.6V, internal DC-DC

converter active and a 50 Ω connection unless speciﬁed otherwise.

Description Typ. Unit

TX current 25 dBm output power @ VCC 3.3 400 mA

RX current @ VCC 3.3 12 mA

Low power (standby) radio off, UART off, RTC running, full RAM retention 2 µA

Low power (shutdown) radio off, UART off, RTC off, no RAM retention 0.9 µA

Table 4: Power consumption

2.4 Radio characteristics