SN260 datasheet(82/88 Pages) STMICROELECTRONICS

82 / 88 page

Typical application

SN260

82/88

Typical application

Figure 12 illustrates the typical application circuit for the SN260. This figure does not contain

all decoupling capacitance required by the SN260. The Balun provides the impedance

transformation from the antenna to the SN260 for both TX and RX modes. The harmonic

filter provides additional suppression of the second harmonic, which increases the margin

over the FCC limit. The 24MHz crystal with loading capacitors is required and provides the

high frequency source for the SN260. The RC debounce filter (R4 and C7) is suggested to

improve the noise immunity of the nRESET logic (Pin 11).

The SIF (nSIF_LOAD, SIF_MOSI, SIF_MISO, and SIF_CLK) and packet trace signals

(PTI_EN and PTI_TXD) should be brought out test points or, if space permits to a 10-pin,

dual row, 0.05-inch pitch header footprint. With a header populated, a direct connection to

the InSight Adapter is possible which enhances the debug capability of the SN260. For more

information, refer to www.stmcu.com.

Figure 12.

Typical application circuit

Table 120 contains the bill of materials for the application circuit shown in Figure 12.

1.8V

Programming and

Debug Interface (these

pins should be routed

to test points)

Serial Interface

(route to Host uP)

Route to LED

or leave unconnected

VDD_VCO

RF_P

VDD_RF

RF_N

RF_TX_ALT_P

RF_TX_ALT_N

VDD_IF

BIAS_R

VDD_PADSA

TX_ACTIVE

nSIF_LOAD

SIF_MOSI

SIF_MISO

SIF_CLK

nHOST_INT

RES

VDD_PADS

PTI_DATA

PTI_EN

nSSEL

11 12 13 14 15 16 17 18 19 20

40 39 38 37 36 35 34 33 32 31

GND

EM260

Ceramic

Balun (BLN1)

1.8V

Harmonic

Filter

VDD_PADS

(2.1V to 3.6V)

VDD_PADS

(2.1V to 3.6V)

SN260

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