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WF61 Product Specification
PRELIMINARY
12mm x 12mm x 2.2 mm (WF61A)
12mm x 12mm x 2.7 mm (WF61L)
Description
Amp’ed RF Tech presents the WF61 WiFi dual
band module: 802.1 1abgn. The WF61 is a small
footprint low cost RF module intended to help
custom ers shorten product developm ent cycles
and reduce cost. It’s integrated 2.4GHz and
5GHz PA provides ready to use dual band RF.
It is fully compatible with Linux & Android
systems or our own upper layer stack, Amp’ed
UP, for a complete host & controller solution.
Features
WLAN
• 802.11a/b/g/n
• Dual Band: 2.4GHz and 5GHz
• Output Power, +21.5dBm for 2.4GHz; +16dBm for
5GHz
• Power savings mode
• Wi-Fi Direct (concurrent)
• Wi-Fi Protected Setup
• Soft Access Point
• Hotspot 2.0
• Security: WPAI/ WPA2, A ES, WEP
Hardware
• Interface, SDIO 2.0 or SPI
• 1 LPO input
• Standby current, 80 μA
• RoHS conformance
• FCC/IC/CE certified (preliminary)
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Contents
1. Har d ware Sp ec if icat ions .................................................................................. 4
1.1. Recommended Operating Conditions .......................................................................................... 4
1.2. Absolute Maximum Ratings ......................................................................................................... 4
1.3. I/O Operating Conditions .............................................................................................................. 4
1.4. Current Consumption ................................................................................................................... 5
1.5. Selected RF Characteristics ......................................................................................................... 6
1.6. Transmit Power Back-off .............................................................................................................. 7
1.7. Pin Assignment ............................................................................................................................ 8
1.8. La yout Dra wing .......................................................................................................................... 10
2. Hardware Block Diagram ............................................................................... 11
3. Hardware Design ............................................................................................ 12
3.1. PCB layout guide ........................................................................................................................ 12
3.2. Modu le Ref lo w Insta llat ion ......................................................................................................... 12
4. Ref eren ce Desig n Example ........................................................................... 13
5. Startup behavior ............................................................................................. 15
5.1. WL_REG_ON ............................................................................................................................. 15
5.2. SDIO and SPI interface .............................................................................................................. 15
6. Ordering Information ..................................................................................... 16
7. Revision History ............................................................................................. 16
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1. Har d ware Sp ec if icat ions
General Conditions (VIN= 3. 6V and 25°C)
1.1. Recommended Operating Conditions
Rating Min Typical Max Unit
Operating Temperature Range -40 - 85 °C
Supply Voltage VIN 2.3 3.6 4.8 Volts
Supply Voltage VDD_3V3 3.0 3.3 3.6 Volts
Supply Voltage VDD_1V8 1.65 1.8 1.95 Volts
Signal Pin V oltage - 1.8 - Volts
RF Frequency for 2.4G 2400 - 2483.5 MHz
RF Frequency for 5G 5150 5850 MHz
1.2. Absolute Maximum Ratings
Rating Min Typical Max Unit
Storage temperature range -55 - +150 °C
Supply voltage VIN -0.3 - +4.8 Volts
Supply Voltage VDD_3V3 -0.3 - 4.0 Volts
Supply Voltage VDD_1V8 -0.3 - 2.0 Volts
I/O pin voltage VIO -0.3 - +2.5 Volts
RF input power - - -5 dBm
1.3. I/O Operating Conditions
Symbol Parameter Min Max Unit
VIL Low-Level Input Voltage - 0.6 Volts
VIH High-Level Input Voltage 1.3 - Volts
VOL Low-Level Output Voltage - 0.2 Volts
VOH High-Level Output Voltage WF61A : 1.6
WF61L: 2.95 - Volts
IOL Low –Level Output Current - 4.0 mA
IOH High-Level Output Current - 4.0 mA
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1.4. Current Consumption
Modes (WLAN Max Power Consumption)
VBAT=3.6v Avg Unit
Complete Power Down (PMUEN low) 17 μA
Sleep 101 μA
Power save (beacon period including DTIM 100ms, beacon length 1ms)
-proprietary power saving feat ures enabl ed 0.77 mA
RX (idle, 2.4GHz) 62.07 mA
RX (active, 2.4GHz, OFDM) 65.87 mA
TX (active, 2.4GHz, OFDM), 15.5dBm @RF port 257.67 mA
TX (active, 2.4GHz, OFDM), 20.5dBm @RF port 279.67 mA
Video streaming; the device is receiving 2.0 Mbps of data using legacy
PSM mode (for example, MPEG-4@2Mbps) 13.31 mA
Ipeak: system maximum peak current draw 378 mA
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1.5. Selected RF Characteristics
Parameters Conditions Typica
l Unit
Antenna load 50 ohm
Wi-Fi Receiver 2.4GHz
Sensitivity DSSS 1Mbps@FER<8% -98.5 dBm
Sensitivity DSSS 2Mbps@FER<8% -96 dBm
Sensitivity CCK 5.5Mbps@FER<8% -94 dBm
Sensitivity CCK 11Mbps@FER<8% -89 dBm
Sensitivity BPSK 6Mbps@PER<10% -94.5 dBm
Sensitivity BPSK 9Mbps@PER<10% -92.5 dBm
Sensitivity QPSK 12Mbps@PER<10% -91.5 dBm
Sensitivity QPSK 18Mbps@PER<10% -89 dBm
Sensitivity 16QAM 24Mbps@PER<10% -86 dBm
Sensitivity 16QAM 36Mbps@PER<10% -83 dBm
Sensitivity 64QAM 48Mbps@PER<10% -78.5 dBm
Sensitivity 64QAM 54Mbps@PER<10% -77 dBm
Sensitivity BPSK 6.5Mbps@PER<10% -92.5 dBm
Sensitivity QPSK 13Mbps@PER<10% -89.5 dBm
Sensitivity QPSK 19.5Mbps@PER<10% -87 dBm
Sensitivity 16QAM 26Mbps@PER<10% -84.5 dBm
Sensitivity 16 QAM 39Mbps@PER<10% -81 dBm
Sensitivity 64QAM 52Mbps@PER<10% -77 dBm
Sensitivity 64QAM 58.5Mbps@PER<10% -75.5 dBm
Sensitivity 64QAM 65Mbps@PER<10% -73.5 dBm
Wi-Fi Receiver 5GHz 11n
Sensitivity BPSK 6.5Mbps@PER<10%,Nss=1 -91 dBm
Sensitivity QPSK 13Mbps@PER<10%, Nss=1 -88 dBm
Sensitivity 16QAM 26MbpsPER<10%,Nss=1 -83 dBm
Sensitivity 64QAM 65MbpsPER<10%,Nss=1 -72.5 dBm
Wi-Fi Transm i tter 2.4GHz
Output Power 802.11b/g BPSK 1/2 20 dBm
Output Power 802.11b/g BPSK 3/4 20 dBm
Output Power 802.11b/g QPSK 1/2 20 dBm
Output Power 802.11b/g QPSK 3/4 20 dBm
Output Power 802.11b/g 16QA M 1/2 19.5 dBm
Output Power 802.11b/g 16QA M 3/4 18.5 dBm
Output Power 802.11b/g 64QA M 2/3 17.5 dBm
Output Power 802.11b/g 64QA M 3/4 16.5 dBm
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Output Power 802.11n MCS-0 20 dBm
Output Power 802.11n MCS-1 20 dBm
Output Power 802.11n MCS-2 20 dBm
Output Power 802.11n MCS-3 19.5 dBm
Output Power 802.11n MCS-4 18.5 dBm
Output Power 802.11n MCS-5 17.5 dBm
Output Power 802.11n MCS-6 16.5 dBm
Output Power 802.11n MCS-7 15.5 dBm
Wi-Fi Transm i tter 5GHz, 11n
Output Power 802.11n MCS-7 16 dBm
1.6. Transmit Power Back-off
Note: Applies to 2.4GHz low band only.
W hen 2.7 V < VIN < 3.6 V, the out put power shal l be back ed off by 0.8 dB per 300 m V drop
of VIN below 3.6 V to guarantee meeting spectral mask, EVM, harmonic levels, spurious
emissions and regulatory requirements in general.
W hen 2.3 V < VIN < 2.7 V, an add itiona l bac k-off of the output power is needed to guarantee
meeting spectral mask, EVM, harmonic levels, spurious emissions and regulatory
requirements in general.
When the load is not 50Ω, the output power is backed off to guarantee meeting spectral mask,
EVM, harmonic levels, spurious emissions and regulatory requirements in general. The device
is able to withstand a VSWR of up to 12:1 without any damage.
W hen the t emperatur e inc r eases f r om +25°C to + 85° C, t he ou tput po wer s ha ll be backed off
by 0.25 dB per 10°C increase to guarantee meeting spectral mask, EVM, harmonic levels,
spurious emissions and regulatory requirements in general.
Tx Power vs Vin
15.0
17.0
19.0
21.0
23.0
25.0
2.4 2.9 3.4
Tx Power dBm
Tx Power dBm
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1.7. Pin Assignment
Name Type Pin # Description ALT Function
Logic Level
WF61A
Logic Level
WF61L
GND
1 Ground connections
2.4G WL_ANT
I/O 2 Antenna port for 2.4G WIFI
GND
3 Ground connections
NC
NC
5 Floating (Don’t connected to ground)
NC
6
Floating (Don’t connected to ground)
NC
7
Floating (Don’t connected to ground)
NC
8
Floating (Don’t connected to ground)
VIN 9 Main power voltage source input
GND
10
Ground connections
5 G WL_ANT
I/O
11
Antenna port for 5G WIFI
WL_REG_ON
I
12
Internal regulators power enable/disable 1.8V 1.8V
WIRQ
O
13
SDIO external interrupt 1.8V 3.3V
SDIO DATA2
I/O
14
SDIO data line 2 / SDIO or SPI selection
1.8V 3.3V
SDIO DATA3
I/O
15
SDIO data line 3
SPI CSN
1.8V 3.3V
SDIO CMD
I/O
16
SDIO command line
SPI DI
1.8V 3.3V
SDIO CLK
I/O
17
SDIO clock line
SPI CLK
1.8V 3.3V
SDIO DATA0
I/O
18
SDIO data line 0
SPI DO
1.8V 3.3V
SDIO DATA1
I/O
19
SDIO data line 1
SPI INT
1.8V 3.3V
GND 20 Ground connections
NC 21 Floating (Don’t connected to ground)
VDD_3V3 22 3.3V power supply input
NC 23 Floating (Don’t connected to ground)
LPO
I
24
low power clock 32.768KHz 1.8V 1.8V
NC
25 Floating (Don’t connected to ground)
NC
26 Floating (Don’t connected to ground)
NC
27 Floating (Don’t connected to ground)
NC
28 Floating (Don’t connected to ground)
VDD_1V8 29 1.8V power supply input
NC
30 Floating (Don’t connected to ground)
GND
31 Ground connections
NC
32 Floating (Don’t connected to ground)
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GND
33 Ground connections
NC
34
Floating (Don’t connected to ground)
NC
35 Floating (Don’t connected to ground)
GND
36 Ground connections
NC
37
Floating (Don’t connected to ground)
NC
38
Floating (Don’t connected to ground)
NC
39
Floating (Don’t connected to ground)
NC
40
Floating (Don’t connected to ground)
NC
43
Floating (Don’t connected to ground)
NC
42
Floating (Don’t connected to ground)
NC
41
Floating (Don’t connected to ground)
NC
44
Floating (Don’t connected to ground)
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1.8. Layout Drawing
Size: 12 mm x 12 mm x 2.7 mm
1 GND
2 2.4G WL_ANT
3 GND
4 NC
5 NC
6 NC
7 NC
9 VIN
10 GND
20 GND
16 SDIO CMD
17 SDIO CLK
13 WIRQ
15 SDIO DATA3
14 SDIO DATA2
18 SDIO DATA0
11 5G WL_ANT
TOP VIEW
19 SDIO DATA1
22 VDD_3V3
21 NC
12 WL_REG_ON
8 NC
23 NC
24 LPO
25 NC
26 NC
27 NC
29 VDD_1V8
31 GND
32 NC
33 GND
30 NC
44 NC
42 NC
40 NC
36 GND
37 NC
35 NC
34 NC
38 NC
39 NC
43 NC
41 NC
28 NC
20 mil
(0.5 mm)
35.4 mil
(0.9 mm)
472.4mil
(12 mm)
472.4 mil
(12 mm)
59 mil
(1.5 mm)
59 mil
(1.5 mm)
59 mil
(1.5 mm)
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3. Hardware Design
3.1. PCB layout guide
• All unused pins should be left floating; do not ground.
• All GND pins must be well grounded.
• Traces should not be routed underneath the module.
• Use short, 50 ohm impedance, RF traces. Routing should be on the top layer.
• A diplexer may be used to combine 2.4GHz and 5GHz RF signals.
• Keep the clock and power signals far away from RF signals.
• Use two 22uF tan capacitors near Vin pin 9.
• SDIO signal traces should be equal length and their offset should be under ±50mil according to the clock of
SDIO.
• All power supply lines should meet their power requirements.
• LPO traces should keep clear from other low frequency traces, such as IIC.
3.2. Module Reflow Installation
The WF61 is a surface mount WiFi module supplied on a 44 pin, 6-layer PCB. The final assembly recommended
reflow prof iles are:
For RoHS/Pb-free applications, Sn96.5/Ag3.0/Cu0.5 solder is recommended.
• Maximum peak temperature of 230° - 240°C (below 250°C).
• Maximum rise and fall slope after liquidous of < 2°C/second.
• Maximum rise and fall slope after liquidous of < 3°C/second.
• Maximum time at liquidous of 40 – 80 seconds.
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5. Startup behavior
5.1. WL_REG_ON
A valid reset shall be obtained by maintaining WL_REG_ON active ( low) for at least two cycles of LPO after
VIN is stable within its operating range. There is no constraint on the activation of the other supplies during this
process.
5.2. SDIO and SPI interface
SDIO DATA2 is the selection pin; the state of this pin is monitored on the rising edge of RESET.
• LOW selects SPI
• HIGH selects SDIO
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6. Ordering Information
Part Name Description
WF61A Dual band, external antenna opti on for 2.4GHz and 5GHz. 1.8V
SDIO logic level, with RF shielding.
WF61A-NS Dual band, external antenna option for 2.4GHz and 5GHz. 1.8V
SDIO logic level, no RF shielding.
WF61A-LB-NS Low band, external antenna option for 2.4GHz and 5GHz. 1.8V
SDIO logic level, no RF shielding.
WF61L Dual band, external ant enna opt i on for 2. 4GHz and 5GHz. 3.3V
SDIO logic level, with RF shielding
7. Revision History
Data Revision Description
27-Apr-2017 1.0 Initial release
2-May-2017 1.1 Added level shifter opti on
8-May-2017 1.2 Update WF61L reference design
30-Jun-2017 1.3 Add PCB layout guide and add some PN
