AX−SFJK, AX−SFJK−API

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6

DC Characteristics

Table 4. SUPPLIES

Conditions for all current and charge values unless otherwise specified are for the hardware configuration described in the AX−SFJK

Application Note: Sigfox Compliant Reference Design.

Symbol

Description

Condition

Min

Typ

Max

Units

Operational ambient temperature

−40

27

85

°C

I/O and voltage regulator supply

voltage

1.8*

3.3

3.6

V

I/O voltage ramp for reset activation

(Note 1)

Ramp starts at VDD_IO ≤ 0.1 V

0.1

V/ms

I/O voltage ramp for reset activation

(Note 1)

Ramp starts at 0.1 V < VDD_IO < 0.7 V

3.3

V/ms

Deep Sleep mode current

AT$P=2

350

nA

Sleep mode current

AT$P=1

1.6

mA

Standby mode current

(Note 2)

0.5

mA

Current consumption continuous RX

AT$TM=3,255

10

mA

Charge to send a Sigfox out of band

message, 13 dBm

AT$SO

0.28

C

Charge to send a bit, 13 dBm

AT$SB=0

0.21

C

Charge to send a bit with downlink

receive, 13 dBm

AT$SB=0,1

0.56

C

Charge to send the longest possible

Sigfox frame (12 byte) , 13 dBm

AT$SF=00112233445566778899aabb

0.34

C

Charge to send the longest possible

Sigfox frame (12 byte) with downlink

receive, 13 dBm

AT$SF=00112233445566778899aabb,1

0.67

C

Modulated Transmitter Current

Pout=13 dBm; average

45

mA

*The device is operational from 1.8 V to 3.6 V. However, a supply voltage below 2.0 V is considered an extreme condition and operation can

lead to reduced output power and increased spurious emission.

1. If VDD_IO ramps cannot be guaranteed, an external reset circuit is recommended, see the AX8052 Application Note: Power On Reset

2. Internal 20 MHz oscillator, voltage conditioning and supervisory circuit running.

Battery Life Examples

Scenario:

per day at Pout=13 dBm

2 AAA alkaline capacity

1500 mAh * 3600 s/h

5400 C

Sleep charge per day

1.8 mA * 86400 s

0.16 C/day

OOB frame transmission

0.34 C/day

Frame transmission with downlink

4 * 0.67 C/day

2.68 C/day

Total Charge consumption

3.18 C/day

Battery life

4.7 Years