WA_DEV_W218_PTS_002 Rev 005 Page 26 of 109

Product Technical Specification &

Customer Design Guidelines

Electrical Characteristics
Table 1. Input Power Supply Voltage
VMIN
VNOM
VMAX
ITYP.
IMAX
Rippl e max (Urip p)
VBATT
3.2(1)
3.6
4.8
1.35A
1.4A
10kHz to 100kHz: less
than100mVpp
greater than 100kHz: less
than 10mVpp
(1): This value has to be guaranteed during the burst (with 1.4A Peak in GSM or GPRS mode)
(2): Maximum operating Voltage Stationary Wave Ratio (VSW R) 1.5:1

When powering the WISMO218 with a battery, the total impedance (battery + protections + PCB)

should be less than 150m.

Pin Description
Table 2. Power Supply Pin Descriptions
Signa l
Pin N umber( s)
VBATT
29,30
GND
20,22,23,26,28,31
Application

The reject filter can be connected between VBATT and the supply sources if the supply source is

noisy.

Caution: If the reject filter (C1+L1+C2) is an option, a capacitor (i.e. C2) is mandatory close to the VBATT.

Filter WISMO218

Supply source VBATT
L1
C1 C2

Figure 3. Reject Filter Diagram