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AN4305 Datasheet(PDF) 6 Page - STMicroelectronics

Part # AN4305
Description  Using the SPIRIT1 transceiver with range extender
PDF  20 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN4305 Datasheet(HTML) 6 Page - STMicroelectronics

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Application circuit
AN4305
6/20
DocID024733 Rev 1
Figure 4. Daughterboard circuit schematic (2 of 2)
C27
C_56p_0402_C0G
L12
L_10n_0603
C32
1 nF
L13
L_15n_0402
C28
C_2.2n_0402_X7R
J1
RF_IN/OUT
C29
C_33p_0402_C0G
SW2
1
3
SW1
2
C24
C_1u_0402_X5R
L15
L_3.3n_0402
C18
C_4.7u_0603_X5R
L11
L_27n_0402
U6
upd5740t6n
IN
1
GND
2
Vcont
3
Vcc
4
NC
5
OUT
6
U4
TA0437A
GND
1
IN
2
GND
3
GND
5
OUT
6
GND
7
L14
L_6.8n_0603
C26
C_1u_0402_X5R
C17
C_22p_0402_C0G
C31
C_18p_0402_COG
C30
C_22p_0402_COG
C25
C_1n_0402_COG
C23
C_1n_0402_X7R
L18
L_4.7n_0402
L17
L_47n_0603
C33
1 nF
L16
L_27n_0603
C10
C_220p_0402_C0G
U3
SKY66100-11
CSD
1
TX
2
CTX
3
RX
4
GND
12
GND
11
TX_IN
10
GND
9
GPIO0
GPIO1
GPIO2
VCC_RF
3V3
TX_Path
GPIO0
GPIO1
RX_Path
GPIO2
TRUTH TABLE
READY => GPIO0 = 0, GPIO1 = 0, GPIO2 = 0
TX => GPIO0 = 1, GPIO1 = 1, GPIO2 = 0
RX => GPIO0 = 1, GPIO1 = 0, GPIO2 = 1
GPIO0 = TX or RX mode indicator
GPIO1 = TX state indication
GPIO2 = RX state indication
Range Extender SKYWORKS SKY66100-11, VCC = 3.3 V
CSD = 0, CTX = BYP = x => Sleep mode
CSD = 1, CTX = BYP = 1 => Transmit with PA mode
CSD = 1, CTX = BYP = 0 => Receiver mode
LNA CEL upd5740t6n
VCC = 3.3 V max, 2.8 V typ, Icc = 5 mA typ
Gain = 15 dB typ, NF = 1.5 dB typ
Vcont = high => LNA-mode, 5 mA
Vcont = low => bypass-mode, 1 uA
Solder a 220pF capacitor
between pins 1 and 2
Solder a 220pF
capacitor between
pins 1 and 3
AM17228v1



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