User's Manual

2 Electrical specifications
As not otherwise stated measured on the evaluation board Themisto-I-EV with T=25°C,
VDDS=3.3V, internal DC-DC converter active and a 50 Ω connection. Any radio transmission
in the standard firmware uses boost mode independent of the chosen output power.
2.1 Recommended operating conditions
Description Min. Typ. Max. Unit
Ambient temperature -40 25 85 °C
Supply voltage (VDDS) 2.2
1
3.0 3.7 V
Rising supply voltage slew rate 0 100 mV/µs
Falling supply voltage slew rate 0 20 mV/µs
Falling supply voltage slew rate, with low power flash settings 3 mV/µs
Table 2: Recommended operating conditions
2.2 Absolute maximum ratings
Description Min. Typ. Max. Unit
Supply voltage (VDDS) -0.3 3.8 V
Voltage on any digital pin -0.3 VDDS + 0.3, max 3.8 V
Input RF level 10 dBm
Output RF level 12 25 25 dBm
Table 3: Absolute maximum ratings
1
Below 2.2V the chipset stops immediately working. A certain buffer for voltage drops should be considered
by for example supplying with 2.4V.
Themisto-I reference manual version 1.0 © August 2019
www.we-online.com/wireless-connectivity 10