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ATWINC3400
Single Chip IEEE 802.11 b/g/n Network Controller with
Integrated Bluetooth 4.0
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Description
The Atmel® ATWINC3400 is a single chip IEEE® 802.11 b/g/n
RF/Baseband/MAC network controller and Bluetooth® Low Energy (BLE) 4.0
optimized for low-power mobile applications. The ATWINC3400 supports single
stream 1x1 802.11n mode providing up to 72Mbps PHY rate. The ATWINC3400
features fully integrated Power Amplifier, LNA, Switch, and Power Management.
ATWINC3400 also features an on-chip microcontroller and integrated Flash
memory for system software. Implemented in 65nm CMOS technology, the
ATWINC3400 offers very low power consumption while simultaneously providing
high performance and minimal bill of materials.
The ATWINC3400 utilizes highly optimized 802.11-BLE coexistence protocols.
The ATWINC3400 provides multiple peripheral interfaces including UART, SPI,
I2C, and SDIO. The only external clock sources needed for the ATWINC3400 is a
high-speed crystal or oscillator with a wide range of reference clock frequencies
supported (14-40MHz) and a 32.768kHz clock for sleep operation. The
ATWINC3400 is available in QFN packaging.
Features
IEEE 802.11
 IEEE 802.11 b/g/n 20MHz (1x1) solution













Single spatial stream in 2.4GHz ISM band
Integrated PA and T/R Switch
Superior Sensitivity and Range via advanced PHY signal processing
Advanced Equalization and Channel Estimation
Advanced Carrier and Timing Synchronization
Wi-Fi Direct and Soft-AP support
Supports IEEE 802.11 WEP, WPA, and WPA2 Security
Supports China WAPI security
Superior MAC throughput via hardware accelerated two-level A-MSDU/AMPDU frame aggregation and block acknowledgement
On-chip memory management engine to reduce host load
SPI, SDIO, I2C, and UART host interfaces
Operating temperature range of -40°C to +85°C
Fast boot options:
– On-Chip Boot ROM (firmware instant boot)
– SPI flash boot (firmware patches and state variables)
– Low-leakage on-chip memory for state variables
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– Fast AP re-association (150ms)
 On-Chip Network Stack to offload MCU:
– Integrated Network IP stack to minimize host CPU requirements
– Network features: TCP, UDP, DHCP, ARP, HTTP, SSL, and DNS
BLE
 BLE 4.0
 Adaptive Frequency Hopping
 HCI (Host Control Interface) via high speed UART
 Integrated PA and T/R Switch
 Superior Sensitivity and Range
 UART host and audio interfaces
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Tabl e of Cont ent s
Description
....................................................................................................................... 1
Features
....................................................................................................................... 1
Table of Contents ................................................................................................................. 3
1
Ordering Information and IC Marking .......................................................................... 5
2
Block Diagram ............................................................................................................... 5
3
Pinout and Package Information ................................................................................. 5
3.1
3.2
4
Electrical Specifications ............................................................................................... 9
4.1
4.2
4.3
5
7.2
7.3
MAC
7.1.1
7.1.2
PHY
7.2.1
7.2.2
Radio
7.3.1
7.3.2
.............................................................................................................................................. 13
Features ................................................................................................................................. 13
Description.............................................................................................................................. 14
.............................................................................................................................................. 14
Features ................................................................................................................................. 14
Description.............................................................................................................................. 15
.............................................................................................................................................. 15
Receiver Performance ............................................................................................................ 15
Transmitter Performance ........................................................................................................ 16
BLE Subsystem ........................................................................................................... 16
8.1
9
Processor ............................................................................................................................................ 12
Memory Subsystem............................................................................................................................. 12
Non-Volatile Memory (eFuse) ............................................................................................................. 12
WLAN Subsystem ....................................................................................................... 13
7.1
8
Crystal Oscillator ................................................................................................................................. 11
Low Power Oscillator ........................................................................................................................... 12
CPU and Memory Subsystems .................................................................................. 12
6.1
6.2
6.3
7
Absolute Ratings ................................................................................................................................... 9
Recommended Operating Conditions ................................................................................................. 10
DC Electrical Characteristics ............................................................................................................... 10
Clocking 11
5.1
5.2
6
Pin Description ...................................................................................................................................... 5
Package Description ............................................................................................................................. 8
BLE Radio ........................................................................................................................................... 17
8.1.1 Receiver Performance ............................................................................................................ 17
8.1.2 Transmitter Performance ........................................................................................................ 17
External Interfaces ...................................................................................................... 18
9.1
9.2
9.3
9.4
9.5
9.6
I2C Slave Interface .............................................................................................................................. 19
I2C Master Interface ............................................................................................................................ 20
SPI Slave Interface.............................................................................................................................. 21
SPI Master Interface............................................................................................................................ 23
SDIO Slave Interface........................................................................................................................... 24
UART .............................................................................................................................................. 26
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9.7
GPIOs
.............................................................................................................................................. 27
10 Power Management ..................................................................................................... 27
10.1 Power Architecture .............................................................................................................................. 27
10.2 Power Consumption ............................................................................................................................ 28
10.2.1 Description of Device States ................................................................................................... 28
10.2.2 Current Consumption in Various Device States ...................................................................... 29
10.2.3 Restrictions for Power States ................................................................................................. 29
10.3 Power-Up/Down Sequence ................................................................................................................. 30
10.4 Digital I/O Pin Behavior During Power-Up Sequences ........................................................................ 31
11 Reference Design ........................................................................................................ 31
12 Reference Design Guidelines ..................................................................................... 33
13 Reference Documentation and Support .................................................................... 33
14 Revision History .......................................................................................................... 34
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Ordering Information and IC Marking
Table 1-1.
2
Ordering Details
Atmel Official Part Number (for ordering)
Package Type
IC Marking
ATWINC3400-MU-T
6x6 QFN in Tape and Reel
ATWINC3400
Block Diagram
Figure 2-1.
ATWINC3400 Block Diagram
Vbatt
SDIO
I2C
SPI
UART
GPIO
PCM
Audio
Interface
RTC
Clock
XO
PMU
Host Interface
Bluetooth
4.0
MAC
Microcontroller
Wi-Fi /
Bluetooth
Coexistence
Flash
RAM
802.11b,g,n
MAC
GFSK Demod
Front
End
8PSK &
QPSK Demod
Front
End
GFSK
Modulator
Front
End
8PSK &
QPSK Mod
Front
End
802.11bgn
Forward
Error
Correction
802.11bgn
Coding
WINC3400
802.11bgn
OFDM
Channel
Estimation /
Equalization
Rx
Digital
Core
802.11bgn
iFFT
Tx
Digital
Core
3
Pinout and Package Information
3.1
Pin Description
ADC
~
PLL
DPD
X
DAC
X
ATWINC3400 is offered in an exposed pad 40-pin QFN package. This package has an exposed paddle that
must be connected to the system board ground. The QFN package pin assignment is shown in Figure 3-1. The
color shading is used to indicate the pin type as follows:





Green – power
Red – analog
Blue – digital I/O
Yellow – digital input
Grey – unconnected or reserved
The ATWINC3400 pins are described in Table 3-1.
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Figure 3-1.
Pin Assignment
Table 3-1.
Pin Description
Pin # Pin Name
6
Pin Type
Description
1
VDDRF_RX
Power
Tuner RF RX Supply (see Section 10.1)
2
VDDAMS
Power
Tuner BB Supply (see Section 10.1)
3
VDDRF_TX
Power
Tuner RF TX Supply (see Section 10.1)
4
VDDBATT_PPA/PA
Power
Battery Supply for PA (see Section 10.1)
5
RFIOP
Analog
Wi-Fi/BLE Pos RF Differential I/O
6
RFION
Analog
Wi-Fi /BLE Neg RF Differential I/O
7
TEST_MODE
Digital Input
Test Mode – Customer Tie to GND
8
SDIO_SPI_CFG
Digital Input
Tie to VDDIO for SPI, GND for SDIO
9
GPIO_38
Digital I/O, Programmable Pull-Down
GPIO_38
10
GPIO_39
Digital I/O, Programmable Pull-Up
GPIO_39
11
GPIO_40
Digital I/O, Programmable Pull-Down
GPIO_40
12
GPIO_42
Digital I/O, Programmable Pull-Down
GPIO_42
13
RESETN
Digital Input
Active-Low Hard Reset
14
GPIO_16
Digital I/O, Programmable Pull-Up
GPIO_16/BLE UART Transmit Data Output
15
GPIO_15
Digital I/O, Programmable Pull-Up
GPIO_15/BLE UART Receive Data Input
16
GPIO_14
Digital I/O, Programmable Pull-Up
GPIO_14/BLE UART RTS output/I2C Slave Data
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Pin # Pin Name
Pin Type
Description
17
GPIO_13
Digital I/O, Programmable Pull-Up
GPIO_13/BLE UART CTS Input/I2C Slave Clock/Wi-Fi UART
TXD Output
18
VDDC
Power
Digital Core Power Supply (see Section 10.1)
19
VDDIO_0
Power
Digital I/O Power Supply (see Section 10.1)
20
GPIO_3
Digital I/O, Programmable Pull-Up
GPIO_3/SPI Flash Clock Output
21
GPIO_4
Digital I/O, Programmable Pull-Up
GPIO_4/SPI Flash SSN Output
22
GPIO_5
Digital I/O, Programmable Pull-Up
GPIO_5/Wi-Fi UART TXD Output/SPI Flash TX Output (MOSI)
23
GPIO_6
Digital I/O, Programmable Pull-Up
GPIO_6/Wi-Fi UART RXD Input/SPI Flash RX Input (MISO)
24
VBATT_BUCK
Power
Battery Supply for DC/DC Converter (see Section 10.1)
25
VSW
Power
Switching Output of DC/DC Converter (see Section 10.1)
26
VREG_BUCK
Power
Core Power from DC/DC Converter (see Section 10.1)
27
CHIP_EN
Analog
PMU Enable
28
RTC_CLK
Digital I/O, Programmable Pull-Up
RTC Clock Input/GPIO_1/Wi-Fi UART RXD Input/Wi-Fi UART
TXD Output/BT UART CTS Input
29
SD_CLK
Digital I/O, Programmable Pull-Up
SDIO Clock/GPIO_8/Wi-Fi UART RXD Input/BT UART CTS Input
30
SD_CMD/SPI_SCK
Digital I/O, Programmable Pull-Up
SDIO Command/SPI Clock
31
SD_DAT0/SPI_TXD
Digital I/O, Programmable Pull-Up
SDIO Data0/SPI TX Data
32
SD_DAT1/SPI_SSN
Digital I/O, Programmable Pull-Up
SDIO Data1/SPI Slave Select
33
VDDIO_1
Power
Digital I/O Power Supply (see Section 10.1)
34
SD_DAT2/SPI_RXD Digital I/O, Programmable Pull-Up
SDIO Data2/SPI RX Data
35
SD_DAT3
Digital I/O, Programmable Pull-Up
SDIO Data3/GPIO_7/Wi-Fi UART TXD output/BT UART RTS
Output
36
GPIO_17
Digital I/O, Programmable Pull-Down
GPIO_17
37
GPIO_18
Digital I/O, Programmable Pull-Down
GPIO_18
38
GPIO_19
Digital I/O, Programmable Pull-Down
GPIO_19
39
GPIO_20
Digital I/O, Programmable Pull-Down
GPIO_20
40
IRQN
Digital I/O, Programmable Pull-Up
Host Interrupt Request Output/Wi-Fi UART RXD Input/BT UART
RTS Output
41
GPIO_21
Digital I/O, Programmable Pull-Up
GPIO_21/RTC Clock/Wi-Fi UART RXD Input/Wi-Fi UART TXD
Output/BT UART RTS Output
42
HOST_WAKEUP
Digital I/O, Programmable Pull-Up
SLEEP Mode Control/Wi-Fi UART TXD output
43
XO_N
Analog
Crystal Oscillator N
44
XO_P
Analog
Crystal Oscillator P
45
VDD_SXDIG
Power
SX Power Supply (see Section 10.1)
46
VDD_VCO
Power
VCO Power Supply (see Section 10.1)
47
VDDIO_A
Power
Tuner VDDIO Power Supply (see Section 10.1)
48
TP_P
Analog
Test Pin/Customer No Connect
49
PADDLE VSS
Power
Connect to System Board Ground
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3.2
Package Description
The ATWINC3400 QFN package information is provided in Table 3-2.
Table 3-2.
QFN Package Information
Parameter
Value
Unit
Package Size
6x6
mm
QFN Pad Count
48
Total Thickness
0.85
QFN Pad Pitch
0.40
Pad Width
0.25
Tolerance
±0.1mm
±0.05mm
mm
Exposed Pad size
4.7x4.7
The ATWINC3400 48 QFN package view is shown in Figure 3-2.
Figure 3-2.
QFN Package
ATWILC3400 QFN Package Top View
ATWILC3400 QFN Package Bottom View
ATWILC3400 QFN Package Side View
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ATWILC3400 QFN Package Notes
The QFN package is a qualified Green Package.
4
Electrical Specifications
4.1
Absolute Ratings
Table 4-1.
Absolute Maximum Ratings
Characteristic
Symbol
Min.
Max.
Core Supply Voltage
VDDC
-0.3
1.5
I/O Supply Voltage
VDDIO
-0.3
5.0
Battery Supply Voltage
VBATT
-0.3
5.0
Digital Input Voltage
VIN
-0.3
VDDIO
Analog Input Voltage
VAIN
-0.3
1.5
ESD Human Body Model
VESDHBM
-1000, -2000 (see notes below)
+1000, +2000 (see notes below)
Storage Temperature
TA
-65
150
Junction Temperature
125
RF input power max
23
Notes:
1.
2.
3.
Unit
V
ºC
dBm
VIN corresponds to all the digital pins.
VAIN corresponds to the following analog pins: VDD_RF_RX, VDD_RF_TX, VDD_AMS, RFIOP, RFION,
XO_N, XO_P, VDD_SXDIG, and VDD_VCO.
For VESDHBM, each pin is classified as Class 1, or Class 2, or both:

The Class 1 pins include all the pins (both analog and digital)

The Class 2 pins are all digital pins only

VESDHBM is ±1kV for Class1 pins. VESDHBM is ±2kV for Class2 pins
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4.2
Recommended Operating Conditions
Table 4-2.
Recommended Operating Conditions
Characteristic
I/O Supply Voltage1
Battery Supply
Voltage2
Symbol
Min.
Typ.
Max.
VDDIO
2.7
3.3
3.6
VBATT
3.0
3.6
4.2
V
Operating Temperature
Notes:
4.3
1.
2.
3.
Unit
-40
85
ºC
I/O supply voltage is applied to the following pins: VDDIO_A, VDDIO.
Battery supply voltage is applied to following pins: VDD_BATT_PPA, VDD_BATT_PA, VBATT_BUCK.
Refer to Section 10.1 and 11 for the details of power connections.
DC Electrical Characteristics
Table 4-3 provides the DC characteristics for the ATWINC3400 digital pads.
Table 4-3.
DC Electrical Characteristics
Characteristic
Min.
Max.
Input Low Voltage VIL
-0.30
0.60
Input High Voltage VIH
VDDIO-0.60
VDDIO+0.30
Output Low Voltage VOL
Output High Voltage VOH
0.45
-0.30
0.63
Input High Voltage VIH
VDDIO-0.60
VDDIO+0.30
Output Low Voltage VOL
0.45
-0.30
0.65
Input High Voltage VIH
VDDIO-0.60
VDDIO+0.30 (up to 3.60)
Output Low Voltage VOL
10
0.45
20
Digital Input Load
6
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0
V
VDDIO-0.50
Output Loading
Pad Drive Strength
V
VDDIO-0.50
Input Low Voltage VIL
Output High Voltage VOH
V
VDDIO-0.50
Input Low Voltage VIL
Output High Voltage VOH
Unit
13.5
pF
mA
5
Clocking
5.1
Crystal Oscillator
Table 5-1.
Crystal Oscillator Parameters
Parameter
Crystal Resonant Frequency
Min.
Typ.
Max.
Unit
12
26
40
MHz
50
150
Ω
Crystal Equivalent Series Resistance
Stability – Initial
Offset1
Stability - Temperature and Aging
Note 1.
-100
100
-25
25
ppm
Initial offset must be calibrated to maintain ±25ppm in all operating conditions. This calibration is performed
during final production testing.
The block diagram in Figure 5-1(a) shows how the internal Crystal Oscillator (XO) is connected to the external
crystal. The XO has 5pF internal capacitance on each terminal XO_P and XO_N. To bypass the crystal
oscillator with an external reference, an external signal capable of driving 5pF can be applied to the XO_N
terminal as shown in Figure 5-1(b).
Figure 5-1.
XO Connections
(a) Crystal Oscillator is Used
(b) Crystal Oscillator is Bypassed
Table 5-2 specifies the electrical and performance requirements for the external clock.
Table 5-2.
Bypass Clock Specification
Parameter
Min.
Max.
Unit
Comments
Oscillation frequency
12
32
MHz
Must be able to drive 5pF load @ desired
frequency
Voltage swing
0.5
1.2
Vpp
Stability – Temperature and Aging
-25
Phase Noise
Jitter(RMS)
+25
ppm
-130
dBc/Hz
<1psec
Must be AC coupled
At 10kHz offset
Based on integrated phase noise spectrum
from 1kHz to 1MHz
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5.2
Low Power Oscillator
ATWILC3400 requires an external 32.768kHz clock to be used for sleep operation, which is provided through
Pin 28 or Pin 41. The frequency accuracy of the external clock has to be within ±200ppm.
6
CPU and Memory Subsystems
6.1
Processor
ATWILC3400 has a Cortus APS3 32-bit processor. This processor performs many of the MAC functions,
including but not limited to association, authentication, power management, security key management, and
MSDU aggregation/de-aggregation. In addition, the processor provides flexibility for various modes of
operation, such as STA and AP modes.
6.2
Memory Subsystem
The APS3 core uses a 256KB instruction/boot ROM (160KB for 802.11 and 96KB for BLE) along with a 420KB
instruction RAM (128KB for 802.11 and 292KB for BLE), and a 128KB data RAM (64KB for 802.11 and 64KB
for BLE). In addition, the device uses a 160KB shared/exchange RAM (128KB for 802.11 and 32KB for BLE),
accessible by the processor and MAC, which allows the processor to perform various data management tasks
on the TX and RX data packets.
6.3
Non-Volatile Memory (eFuse)
ATWILC3400 has 768 bits of non-volatile eFuse memory that can be read by the CPU after device reset. This
non-volatile one-time-programmable memory can be used to store customer-specific parameters, such as
802.11 MAC address, BLE address, and various calibration information, such as TX power, crystal frequency
offset, etc., as well as other software-specific configuration parameters. The eFuse is partitioned into six 128bit banks. The bit map of the first and last banks is shown in Figure 6-1. The purpose of the first 80 bits in bank
0 and the first 56 bits in bank 5 is fixed, and the remaining bits are general-purpose software dependent bits, or
reserved for future use. Since each bank and each bit can be programmed independently, this allows for
several updates of the device parameters following the initial programming, e.g., updating 802.11 MAC
address or BLE address (this can be done by invalidating the last programmed bank and programming a new
bank). Refer to ATWILC3400 Programming Guide for the eFuse programming instructions.
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48
8
Bank 0
F
MAC ADDR
7
8
G
Used
1
15
Freq.
Offset
1
TX
Gain
Correc
tion
1
Used
4
Reserved
3
Version
1
Invalid
Used
1
eFuse Bit Map
MAC ADDR
Used
Figure 6-1.
16
FO
Bank 1
Bank 2
Bank 3
Bank 4
8
Bank 5
F
48
BT ADDR
7
Reserved
1
Version
1
Reserved
BT ADDR
Used
BT ADDR
Invalid
128 Bits
2
3
1
WLAN Subsystem
The WLAN subsystem is composed of the Media Access Controller (MAC) and the Physical Layer (PHY). The
following two subsections describe the MAC and PHY in detail.
7.1
MAC
7.1.1
Features
The ATWILC3400 IEEE802.11 MAC supports the following functions:






IEEE 802.11b/g/n
IEEE 802.11e WMM QoS EDCA/PCF multiple access categories traffic scheduling
Advanced IEEE 802.11n features:
– Transmission and reception of aggregated MPDUs (A-MPDU)
– Transmission and reception of aggregated MSDUs (A-MSDU)
– Immediate Block Acknowledgement
– Reduced Interframe Spacing (RIFS)
Support for IEEE802.11i and WFA security with key management
– WEP 64/128
– WPA-TKIP
– 128-bit WPA2 CCMP (AES)
Support for WAPI security
Advanced power management:
– Standard 802.11 Power Save Mode
– Wi-Fi Alliance WMM-PS (U-APSD)
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3



7.1.2
RTS-CTS and CTS-self support
Supports either STA or AP mode in the infrastructure basic service set mode
Supports independent basic service set (IBSS)
Description
The ATWILC3400 MAC is designed to operate at low power while providing high data throughput. The IEEE
802.11 MAC functions are implemented with a combination of dedicated data path engines, hardwired control
logic, and a low-power, high-efficiency microprocessor. The combination of dedicated logic with a
programmable processor provides optimal power efficiency and real-time response while providing the
flexibility to accommodate evolving standards and future feature enhancements.
Dedicated data path engines are used to implement data path functions with heavy computational. For
example, an FCS engine checks the CRC of the transmitting and receiving packets, and a cipher engine
performs all the required encryption and decryption operations for the WEP, WPA-TKIP, WPA2 CCMP-AES,
and WAPI security requirements.
Control functions which have real-time requirements are implemented using hardwired control logic modules.
These logic modules offer real-time response while maintaining configurability via the processor. Examples of
hardwired control logic modules are the channel access control module (implements EDCA/HCCA, Beacon TX
control, interframe spacing, etc.), protocol timer module (responsible for the Network Access Vector, back-off
timing, timing synchronization function, and slot management), MPDU handling module, aggregation/deaggregation module, block ACK controller (implements the protocol requirements for burst block
communication), and TX/RX control FSMs (coordinate data movement between PHY-MAC interface, cipher
engine, and the DMA interface to the TX/RX FIFOs).
The MAC functions implemented solely in software on the microprocessor have the following characteristics:



Functions with high memory requirements or complex data structures. Examples are association table
management and power save queuing
Functions with low computational load or without critical real-time requirements. Examples are
authentication and association
Functions which need flexibility and upgradeability. Examples are beacon frame processing and QoS
scheduling
7.2
PHY
7.2.1
Features
The ATWILC3400 IEEE802.11 PHY supports the following functions:







14
Single antenna 1x1 stream in 20MHz channels
Supports IEEE 802.11b DSSS-CCK modulation: 1, 2, 5.5, and 11Mbps
Supports IEEE 802.11g OFDM modulation: 6, 9, 12,18, 24, 36, 48, and 54Mbps
Supports IEEE 802.11n HT modulations MCS0-7, 20MHz, 800 and 400ns guard interval: 6.5, 7.2, 13.0,
14.4, 19.5, 21.7, 26.0, 28.9, 39.0, 43.3, 52.0, 57.8, 58.5, 65.0, and 72.2Mbps
IEEE 802.11n mixed mode operation
Per packet TX power control
Advanced channel estimation/equalization, automatic gain control, CCA, carrier/symbol recovery, and
frame detection
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7.2.2
Description
The ATWILC3400 WLAN PHY is designed to achieve reliable and power-efficient physical layer
communication specified by IEEE 802.11b/g/n in single stream mode with 20MHz bandwidth. Advanced
algorithms have been employed to achieve maximum throughput in a real world communication environment
with impairments and interference. The PHY implements all the required functions such as FFT, filtering, FEC
(Viterbi decoder), frequency and timing acquisition and tracking, channel estimation and equalization, carrier
sensing and clear channel assessment, as well as the automatic gain control.
7.3
Radio
7.3.1
Receiver Performance
Radio Performance under Typical Conditions: VBATT=3.6V; VDDIO=3.3V; Temperature: 25°C.
Table 7-1.
Receiver Performance
Parameter
Description
Frequency
Sensitivity
802.11b
Min.
Typ.
2,412
1Mbps DSS
-98.0
2Mbps DSS
-95.0
5.5Mbps DSS
-93.0
11Mbps DSS
-89.0
6Mbps OFDM
-90.6
9Mbps OFDM
-89.0
12Mbps OFDM
-87.9
18Mbps OFDM
-86.0
24Mbps OFDM
-83.0
36Mbps OFDM
-79.8
48Mbps OFDM
-76.0
54Mbps OFDM
-74.3
MCS 0
-89.0
MCS 1
-86.9
MCS 2
-84.9
MCS 3
-82.4
MCS 4
-79.2
MCS 5
-75.0
MCS 6
-73.2
MCS 7
-71.2
Max.
Unit
2,484
MHz
dBm
dBm
Sensitivity
802.11g
dBm
Sensitivity
802.11n
(BW=20MHz)
Maximum Receive
Signal Level
Adjacent Channel
dBm
1-11Mbps DSS
-10
5
6-54Mbps OFDM
-10
-3
MCS 0 – 7
-10
-3
1Mbps DSS (30MHz offset)
dBm
50
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7.3.2
Parameter
Description
Min.
Typ.
Rejection
11Mbps DSS (25MHz offset)
43
6Mbps OFDM (25MHz offset)
40
54Mbps OFDM (25MHz offset)
25
MCS 0 – 20MHz BW (25MHz offset)
40
MCS 7 – 20MHz BW (25MHz offset)
20
Max.
Unit
Max.
Unit
2,484
MHz
Transmitter Performance
Radio Performance under Typical Conditions: VBATT=3.6V; VDDIO=3.3V; Temp: 25°C.
Table 7-2.
Transmitter Performance
Parameter
Description
Frequency
802.11b DSSS 1Mbps
201
802.11b DSSS 11Mbps
171
802.11g OFDM 6Mbps
161
TX Power Accuracy
Carrier Suppression
Harmonic Output
Power
8
1.
2.
3.
Typ.
2,412
Output Power
Notes:
Min.
dBm
±1.52
dB
30.0
dBc
2nd
-125
3rd
-125
dBm/Hz
Measured at 802.11 spec compliant EVM/Spectral Mask.
Measured at RF Pin assuming 50Ω differential.
RF performance guaranteed for Temp range -30 to 85°C. 1dB derating in performance at -40°C.
BLE Subsystem
The BLE subsystem implements all the mission critical real-time functions. It encodes/decodes HCI packets,
constructs baseband data packages and manages and monitors connection status, slot usage, data flow,
routing, segmentation, and buffer control.
The BLE subsystem performs Link Control Layer management supporting the following states:





Standby
Connection
Page and Page Scan
Inquiry and Inquiry Scan
Sniff
The BLE subsystem supports BLE profiles allowing connection to advanced low energy application such as:





16
Smart Energy
Consumer Wellness
Home Automation
Security
Proximity Detection
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


Entertainment
Sports and Fitness
Automotive
8.1
BLE Radio
8.1.1
Receiver Performance
Radio Performance under Typical Conditions: VBATT=3.6V; VDDIO=3.3V; Temp: 25°C.
Table 8-1.
ATWILC3400 BLE Receiver Performance
Parameter
Description
Frequency
8.1.2
Min.
Typ.
2,402
Sensitivity
Ideal TX
BLE (GFSK)
Maximum Receive
Signal Level
BLE (GFSK)
-10
Max.
Unit
2,480
MHz
-96
dBm
0
dBm
Transmitter Performance
Radio Performance under Typical Conditions: VBATT=3.6V; VDDIO=3.3V; Temp: 25°C.
Table 8-2.
Parameter
ATWILC3400 BLE Transmitter Performance
Description
Frequency
Output Power
Min.
Typ.
2,402
BLE (GFSK)
-30
8
Max.
Unit
2,480
MHz
10
dBm
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9
External Interfaces
ATWINC3400 external interfaces include: SPI Slave, SDIO Slave, and UART for 802.11 control and data
transfer, UART for BLE control and data transfer, I2C Slave for control, SPI Master for external Flash, I2C
Master for external EEPROM, and General Purpose Input/Output (GPIO) pins. With the exception of the SPI
Slave and SDIO Slave host interfaces, which are selected using the dedicated SDIO_SPI_CFG pin, the other
interfaces can be assigned to various pins by programming the corresponding pin muxing control register for
each pin to a specific value between 0 and 6.The default values of these registers are 0, which is GPIO mode.
Each digital I/O pin also has a programmable pull-up or pull-down. The summary of the available interfaces
and their corresponding pin mux settings is shown in Table 9-1. For specific programming instructions refer to
ATWINC3400 Programming Guide.
Table 9-1.
18
Pin-Mux Matrix of External Interfaces
Pin name
Pin #
Pull
Mux0
Mux1
GPIO_38
9
Down
I_WAKEUP
GPIO_39
10
Up
I_WAKEUP
GPIO_40
11
Down
I_WAKEUP
GPIO_42
12
Down
GPIO_16
14
Up
GPIO_16
O_BT_UAR
T1_TXD
GPIO_15
15
Up
GPIO_15
I_BT_UART
1_RXD
GPIO_14
16
Up
GPIO_14
O_BT_UAR
T1_RTS
IO_I2C_SDA
GPIO_13
17
Up
GPIO_13
I_BT_UART
1_CTS
IO_I2C_SCL
GPIO_3
20
Up
GPIO_3
O_SPI_SCK
_FLASH
O_BT_UAR
T2_TXD
GPIO_4
21
Up
GPIO_4
O_SPI_SSN
_FLASH
I_BT_UART
2_RXD
GPIO_5
22
Up
GPIO_5
O_SPI_TXD
_FLASH
O_WIFI_UA
RT_TXD
I_WAKEUP
GPIO_6
23
Up
GPIO_6
I_SPI_RXD_
FLASH
I_WIFI_UAR
T_RXD
I_WAKEUP
RTC_CLK
28
Up
GPIO_1
I_RTC_CLK
I_WIFI_UAR
T_RXD
O_WIFI_UA
RT_TXD
SD_CLK/GPI
O_8
29
Up
GPIO_8
I_SD_CLK
I_WIFI_UAR
T_RXD
I_BT_UART
1_CTS
SD_CMD/SP
I_SCK
30
Up
IO_SD_CM
D
IO_SPI_SC
K
SD_DAT0/S
PI_TXD
31
Up
IO_SD_DAT
0
O_SPI_TXD
SD_DAT1/S
PI_SSN
32
Up
IO_SD_DAT
1
IO_SPI_SS
N
SD_DAT2/S
PI_RXD
34
Up
IO_SD_DAT
2
I_SPI_RXD
SD_DAT3/G
PIO_7
35
Up
GPIO_7
O_WIFI_UA
RT_TXD
O_BT_UAR
T1_RTS
GPIO_17
36
Down
GPIO_17
I_WAKEUP
GPIO_18
37
Down
GPIO_18
I_WAKEUP
GPIO_19
38
Down
GPIO_19
I_WAKEUP
IO_SD_DAT
3
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Mux2
Mux3
Mux4
Mux5
Mux6
I_WAKEUP
O_WIFI_UA
RT_TXD
I_WAKEUP
I_BT_UART
1_CTS
9.1
Pin name
Pin #
GPIO_20
39
Pull
Down
Mux0
Mux1
Mux2
Mux3
Mux4
O_BT_UAR
T1_RTS
O_WIFI_UA
RT_TXD
Mux5
GPIO_20
Mux6
I_WAKEUP
IRQN
40
Up
GPIO_2
O_IRQN
I_WIFI_UAR
T_RXD
GPIO_21
41
Up
GPIO_21
I_RTC_CLK
I_WIFI_UAR
T_RXD
HOST_WAK
EUP
42
Up
GPIO_0
I_WAKEUP
O_WIFI_UA
RT_TXD
O_BT_UAR
T1_RTS
IO_I2C_MA
STER_SCL
IO_I2C_MA
STER_SDA
I2C Slave Interface
The I2C Slave interface, used primarily for control by the host processor, is a two-wire serial interface
consisting of a serial data line (SDA) on Pin 16 (GPIO14) and a serial clock line (SCL) on Pin 17 (GPIO13). I2C
Slave responds to the seven bit address value 0x60. The ATWILC3400 I2C supports I2C bus Version 2.1 2000 and can operate in standard mode (with data rates up to 100Kb/s) and fast mode (with data rates up to
400Kb/s).
The I2C Slave is a synchronous serial interface. The SDA line is a bidirectional signal and changes only while
the SCL line is low, except for STOP, START, and RESTART conditions. The output drivers are open-drain to
perform wire-AND functions on the bus. The maximum number of devices on the bus is limited by only the
maximum capacitance specification of 400pF. Data is transmitted in byte packages.
For specific information, refer to the Philips Specification entitled “The I2C -Bus Specification, Version 2.1”.
Figure 9-1.
I2C Slave Timing Diagram
tPR
tSUDAT
tHDDAT
tBUF
tSUSTO
SDA
tHL
tLH
tWL
SCL
tHDSTA
tLH
tHL
tWH
tPR
fSCL
tPR
tSUSTA
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Table 9-2.
I2C Slave Timing Parameters
Parameter
Symbol
Min.
Max.
Unit
SCL Clock Frequency
fSCL
0
400
kHz
SCL Low Pulse Width
tWL
1.3
SCL High Pulse Width
tWH
0.6
SCL, SDA Fall Time
tHL
300
SCL, SDA Rise Time
tLH
300
START Setup Time
tSUSTA
0.6
START Hold Time
tHDSTA
0.6
SDA Setup Time
tSUDAT
100
SDA Hold Time
tHDDAT
Remarks
µs
ns
This is dictated by external
components
µs
0
ns
40
STOP Setup Time
tSUSTO
0.6
Bus Free Time Between STOP and START
tBUF
1.3
Glitch Pulse Reject
tPR
0
Slave and Master Default
Master Programming Option
µs
9.2
50
ns
I2C Master Interface
ATWILC3400 provides an I2C bus master, which is intended primarily for accessing an external EEPROM
memory through a software-defined protocol. The I2C Master is a two-wire serial interface consisting of a serial
data line (SDA) and a serial clock line (SCL). SDA can be configured on pin 42 (HOST_WAKEUP), and SCL
can be configured on pin 41 (GPIO21).
The I2C Master interface supports three speeds:



Standard mode (100kb/s)
Fast mode (400kb/s)
High-speed mode (3.4Mb/s)
The timing diagram of the I2C Master interface is the same as that of the I2C Slave interface (see Figure 9-1).
The timing parameters of I2C Master are shown in Table 9-3.
Table 9-3.
I2C Master Timing Parameters
Standard Mode
Parameter
Fast Mode
Symbol
High-Speed
Mode
Min.
Max.
Min.
Max.
Min.
Max.
100
0
400
0
3400
SCL Clock Frequency
fSCL
0
SCL Low Pulse Width
tWL
4.7
1.3
0.16
SCL High Pulse Width
tWH
4
0.6
0.06
SCL Fall Time
tHLSCL
300
300
10
40
SDA Fall Time
tHLSDA
300
300
10
80
SCL Rise Time
tLHSCL
1000
300
10
40
SDA Rise Time
tLHSDA
1000
300
10
80
Unit
kHz
µs
ns
20
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Standard Mode
Parameter
High-Speed
Mode
Fast Mode
Symbol
Min.
Max.
Min.
Max.
Min.
START Setup Time
tSUSTA
4.7
0.6
0.16
START Hold Time
tHDSTA
4
0.6
0.16
SDA Setup Time
tSUDAT
250
100
10
SDA Hold Time
tHDDAT
5
40
0
STOP Setup time
tSUSTO
4
0.6
0.16
Bus Free Time Between STOP and
START
tBUF
4.7
1.3
Glitch Pulse Reject
tPR
Unit
Max.
µs
ns
9.3
70
µs
50
ns
SPI Slave Interface
ATWILC3400 provides a Serial Peripheral Interface (SPI) that operates as a SPI slave. The SPI Slave interface
can be used for control and for serial I/O of 802.11 data. The SPI Slave pins are mapped as shown in Table 94. The RXD pin is same as Master Output, Slave Input (MOSI), and the TXD pin is same as Master Input,
Slave Output (MISO). The SPI Slave is a full-duplex slave-synchronous serial interface that is available
immediately following reset when Pin 12 (SDIO_SPI_CFG) is tied to VDDIO.
Table 9-4.
SPI Slave Interface Pin Mapping
Pin #
SPI Function
12
CFG: Must be tied to VDDIO
32
SSN: Active Low Slave Select
30
SCK: Serial Clock
34
RXD: Serial Data Receive (MOSI)
31
TXD: Serial Data Transmit (MISO)
When the SPI is not selected, i.e., when SSN is high, the SPI interface will not interfere with data transfers
between the serial-master and other serial-slave devices. When the serial slave is not selected, its transmitted
data output is buffered, resulting in a high impedance drive onto the serial master receive line.
The SPI Slave interface responds to a protocol that allows an external host to read or write any register in the
chip as well as initiate DMA transfers. For the details of the SPI protocol and more specific instructions refer to
ATWILC3400 Programming Guide.
The SPI Slave interface supports four standard modes as determined by the Clock Polarity (CPOL) and Clock
Phase (CPHA) settings. These modes are illustrated in Table 9-5 and Figure 9-2. The red lines in Figure 9-2
correspond to Clock Phase = 0 and the blue lines correspond to Clock Phase = 1.
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Table 9-5.
Figure 9-2.
SPI Slave Modes
Mode
CPOL
CPHA
0
0
0
1
0
1
2
1
0
3
1
1
SPI Slave Clock Polarity and Clock Phase Timing
CPOL = 0
SCK
CPOL = 1
SSN
CPHA = 0
RXD/TXD
(MOSI/MISO)
CPHA = 1
z
1
z
2
1
3
2
4
3
5
4
6
5
7
6
8
7
z
8
z
The SPI Slave timing is provided in Figure 9-3 and Table 9-6.
22
Figure 9-3.
SPI Slave Timing Diagram
Table 9-6.
SPI Slave Timing Parameters
Parameter
Symbol
Clock Input Frequency
fSCK
Clock Low Pulse Width
tWL
5
Clock High Pulse Width
tWH
5
Clock Rise Time
tLH
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Min.
Max.
Unit
48
MHz
ns
5
9.4
Parameter
Symbol
Min.
Clock Fall Time
tHL
Input Setup Time
tISU
5
Input Hold Time
tIHD
5
Output Delay
tODLY
0
Slave Select Setup Time
tSUSSN
5
Slave Select Hold Time
tHDSSN
5
Max.
Unit
5
20
SPI Master Interface
ATWILC3400 provides a SPI Master interface for accessing external Flash memory. The SPI Master pins are
mapped as shown in Table 9-7. The TXD pin is same as Master Output and Slave Input (MOSI). The RXD pin
is same as Master Input and Slave Output (MISO). The SPI Master interface supports all four standard modes
of clock polarity and clock phase shown in Table 9-5. External SPI Flash memory is accessed by a processor
programming commands to the SPI Master interface, which in turn initiates a SPI master access to the Flash.
For more specific instructions refer to ATWILC3400 Programming Guide.
Table 9-7.
SPI Master Interface Pin Mapping
Pin #
Pin Name
SPI Function
20
GPIO3
SCK: Serial Clock Output
21
GPIO4
SCK: Active Low Slave Select Output
22
GPIO5
TXD: Serial Data Transmit Output (MOSI)
23
GPIO6
RXD: Serial Data Receive Input (MISO)
The SPI Master timing is provided in Figure 9-4 and Table 9-8.
Figure 9-4.
SPI Master Timing Diagram
fSCK
tLH
tWH
tWL
SCK
tHL
SSN,
TXD
tODLY
tISU
tIHD
RXD
Table 9-8.
SPI Master Timing Parameters
Parameter
Symbol
Clock Output Frequency
fSCK
Min.
Max.
Unit
48
MHz
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9.5
Parameter
Symbol
Min.
Max.
Clock Low Pulse Width
tWL
5
Clock High Pulse Width
tWH
5
Clock Rise Time
tLH
5
Clock Fall Time
tHL
5
Input Setup Time
tISU
5
Input Hold Time
tIHD
5
Output Delay
tODLY
0
Unit
ns
5
SDIO Slave Interface
The ATWINC3400 SDIO Slave is a full speed interface. The interface supports the 1-bit/4-bit SD transfer mode
at the clock range of 0-50MHz. The Host can use this interface to read and write from any register within the
chip as well as configure the ATWINC3000 for data DMA. To use this interface, pin 12 (SDIO_SPI_CFG) must
be grounded. The SDIO Slave pins are mapped as shown in Table 9-9.
Table 9-9.
SDIO Interface Pin Mapping
Pin #
SPI Function
12
CFG: Must be tied to ground
35
DAT3: Data 3
34
DAT2: Data 2
32
DAT1: Data 1
31
DAT0: Data 0
30
CMD: Command
29
CLK: Clock
When the SDIO card is inserted into an SDIO aware host, the detection of the card will be via the means
described in SDIO specification. During the normal initialization and interrogation of the card by the host, the
card will identify itself as an SDIO device. The host software will obtain the card information in a tuple (linked
list) format and determine if that card’s I/O function(s) are acceptable to activate. If the card is acceptable, it will
be allowed to power up fully and start the I/O function(s) built into it.
The SD memory card communication is based on an advanced 9-pin interface (Clock, Command, and four
data and three power lines) designed to operate at maximum operating frequency of 50MHz.
The SDIO Slave interface has the following features:






Meets SDIO card specification version 2.0
Host clock rate variable between 0 and 50MHz
1 bit/4-bit SD bus modes supported
Allows card to interrupt host
Responds to Direct read/write (IO52) and Extended read/write (IO53) transactions
Supports Suspend/Resume operation
The SDIO Slave interface timing is provided in Figure 9-5 and Table 9-10.
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Figure 9-5.
SDIO Slave Timing Diagram
fpp
tWL
SD_CLK
tHL
tWH
tLH
tISU
tIH
Inputs
tODLY(MAX)
tODLY(MIN)
Outputs
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Table 9-10.
9.6
SDIO Slave Timing Parameters
Parameter
Symbol
Min.
Max.
Unit
Clock Input Frequency
fPP
0
50
MHz
Clock Low Pulse Width
tWL
10
Clock High Pulse Width
tWH
10
Clock Rise Time
tLH
10
Clock Fall Time
tHL
10
Input Setup Time
tISU
5
Input Hold Time
tIH
5
Output Delay
tODLY
0
ns
14
UART
ATWILC3400 provides Universal Asynchronous Receiver/Transmitter (UART) interfaces for serial
communication. The BLE subsystem has two UART interfaces: a 4-pin interface for control, data transfer, and
audio (BT UART1), and a 2-pin interface for debugging (BT UART2). The 802.11 subsystem has one 2-pin
UART interface (Wi-Fi UART), which can be used for control, data transfer, or debugging. The UART interfaces
are compatible with the RS-232 standard, where ATWILC3400 operates as Data Terminal Equipment (DTE).
The 2-pin UART has the receive and transmit pins (RXD and TXD), and the 4-pin UART has two additional
pins used for flow control/handshaking: Request To Send (RTS) and Clear To Send (CTS). The pins
associated with each UART interfaces can be enabled on several alternative pins by programming their
corresponding pin MUX control registers (see Table 9-1 for available options).
The UART features programmable baud rate generation with fractional clock division, which allows
transmission and reception at a wide variety of standard and non-standard baud rates. The BLE UART input
clock is selectable between 104MHz, 52MHz, 26MHz, and 13MHz. The clock divider value is programmable as
13 integer bits and three fractional bits (with 8.0 being the smallest recommended value for normal operation).
This results in the maximum supported baud rate of 10MHz/8.0 = 13MBd. The 802.11 UART input clock is
selectable between 10MHz, 5MHz, 2.5MHz, and 1.25MHz. The clock divider value is programmable as 13
integer bits and three fractional bits (with 8.0 being the smallest recommended value for normal operation).
This results in the maximum supported baud rate of 10MHz/8.0 = 1.25MBd.
The UART can be configured for seven or eight bit operation, with or without parity, with four different parity
types (odd, even, mark, or space), and with one or two stop bits. It also has RX and TX FIFOs, which ensure
reliable high speed reception and low software overhead transmission. FIFO size is 4 x8 for both RX and TX
direction. The UART also has status registers showing the number of received characters available in the FIFO
and various error conditions, as well the ability to generate interrupts based on these status bits.An example of
UART receiving or transmitting a single packet is shown in Figure 9-6. This example shows 7-bit data (0x45),
odd parity, and two stop bits.
For more specific instructions refer to ATWILC3400 Programming Guide.
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Figure 9-6.
9.7
Example of UART RX or TX Packet
GPIOs
18 General Purpose Input/Output (GPIO) pins, labeled GPIO 0-8 and 13-21, are available to allow for
application specific functions. Each GPIO pin can be programmed as an input (the value of the pin can be read
by the host or internal processor) or as an output (the output values can be programmed by the host or internal
processor), where the default mode after power-up is input. GPIOs 7 and 8 are only available when the host
does not use the SDIO interface, which shares two of its pins with these GPIOs. Therefore, for SDIO-based
applications, 16 GPIOs (0-6 and 13-21) are available. For more specific usage instructions refer to
ATWILC3400 Programming Guide.
10
Power Management
10.1
Power Architecture
ATWILC3400 uses an innovative power architecture to eliminate the need for external regulators and reduce
the number of off-chip components. This architecture is shown in Figure 10-1. The Power Management Unit
(PMU) has a DC/DC Converter that converts VBATT to the core supply used by the digital and RF/AMS blocks.
Table 10-1 shows the typical values for the digital and RF/AMS core voltages. The PA and eFuse are supplied
by dedicated LDOs, and the VCO is supplied by a separate LDO structure.
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Figure 10-1.
Power Architecture
RF/AMS
VDDIO
VDD_VCO
VDDIO_A
1.2V
LDO1
LDO2
VDD_BATT
VBATT
PA
1.0V
~
SX
VDD_AMS,
VDD_RF,
VDD_SXDIG
EFuse
LDO
RF/AMS Core
2.5V
Digital
VDDC
VDDIO
RF/AMS Core Voltage
EFuse
Digital Core
Pads
dcdc_ena
PMU
Digital Core Voltage
Sleep
Osc
CHIP_EN
ena
Sleep
LDO
Dig Core
LDO
ena
VREG_BUCK
ena
VBATT_BUCK
DC/DC Converter
Vin
Table 10-1.
VSW
Vout
Off-Chip
LC
PMU Output Voltages
Parameter
Typical
RF/AMS Core Voltage (VREG_BUCK)
1.3V
Digital Core Voltage (VDDC)
1.1V
The power connections in Figure 10-1 provide a conceptual framework for understanding the ATWILC3400
power architecture. Refer to the reference design for an example of power supply connections, including
proper isolation of the supplies used by the digital and RF/AMS blocks.
10.2
Power Consumption
10.2.1 Description of Device States
ATWILC3400 has several devices states:


28
ON_WiFi_Transmit:
ON_WiFi_Receive:
Device is actively transmitting an 802.11 signal
Device is actively receiving an 802.11 signal
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



ON_BT_Transmit:
ON_BT_Receive:
ON_Doze:
Power_Down:
Device is actively transmitting a BLE signal
Device is actively receiving a BLE signal
Device is on but is neither transmitting nor receiving
Device core supply off (Leakage)
The following pins are used to switch between the ON and Power_Down states:

CHIP_EN:
Device pin (pin #27) used to enable DC/DC Converter

VDDIO:
I/O supply voltage from external supply
In the ON states, VDDIO is on and CHIP_EN is high (at VDDIO voltage level). To switch between the ON states
and Power_Down state CHIP_EN has to change between high and low (GND) voltage. When VDDIO is off and
CHIP_EN is low, the chip is powered off with no leakage (also see Note 1 in Table 10-2).
10.2.2 Current Consumption in Various Device States
Table 10-2.
Current Consumption
Device State
Code Rate
Output Power,
dBm
Power Consumption1,2
IVBATT
IVDDIO
802.11b 1Mbps
19.2
325 mA
2.7 mA
802.11b 11Mbps
20.1
322 mA
2.7 mA
802.11g 6Mbps
17.8
318 mA
2.7 mA
802.11g 54Mbps
16.2
280 mA
2.7 mA
802.11n MCS 0
19.5
321 mA
2.7 mA
802.11n MCS 7
15.3
276 mA
2.7 mA
802.11b 1Mbps
N/A
83.7 mA
2.5 mA
802.11b 11Mbps
N/A
84.9 mA
2.5 mA
802.11g 6Mbps
N/A
85.8 mA
2.5 mA
802.11g 54Mbps
N/A
90.1 mA
2.5 mA
802.11n MCS 0
N/A
86 mA
2.5 mA
802.11n MCS 7
N/A
91.8 mA
2.5 mA
ON_BT_Transmit
TBD
TBD
TBD
TBD
ON_BT_Receive
TBD
N/A
<45mA
<2.5mA
Doze
N/A
N/A
<0.65mA
<7µA
Power_Down
N/A
N/A
<0.5µA
<3.5µA
ON_WiFi_Transmit
ON_WiFi_Receive
Notes:
1.
2.
Conditions: VBATT @3.6v, VDDIO @2.8V, 25°C
Power consumption numbers are preliminary
10.2.3 Restrictions for Power States
When no power supplied to the device, i.e., the DC/DC Converter output and VDDIO are both off (at ground
potential). In this case, a voltage cannot be applied to the device pins because each pin contains an ESD
diode from the pin to supply. This diode will turn on when voltage higher than one diode-drop is supplied to the
pin.
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If a voltage must be applied to the signal pads while the chip is in a low power state, the VDDIO supply must
be on, so the SLEEP or Power_Down state must be used.
Similarly, to prevent the pin-to-ground diode from turning on, do not apply a voltage that is more than one
diode-drop below ground to any pin.
10.3
Power-Up/Down Sequence
The power-up/down sequence for ATWILC3400 is shown in Figure 10-2. The timing parameters are provided
in Table 10-3.
Figure 10-2.
Power Up/Down Sequence
VBATT
tA
t A'
VDDIO
tB
t B'
CHIP_EN
tC
t C'
RESETN
XO Clock
Table 10-3.
Parameter
Power-Up/Down Sequence Timing
Min.
Max.
Unit
Description
Notes
tA
0
VBATT rise to VDDIO rise
VBATT and VDDIO can rise simultaneously or
can be tied together. VDDIO must not rise before VBATT.
tB
0
VDDIO rise to CHIP_EN rise
CHIP_EN must not rise before VDDIO.
CHIP_EN must be driven high or low, not left
floating.
tC
5
CHIP_EN rise to RESETN rise
This delay is needed because XO clock must
stabilize before RESETN removal. RESETN
must be driven high or low, not left floating.
ms
30
tA’
0
VDDIO fall to VBATT fall
VBATT and VDDIO can fall simultaneously or
can be tied together. VBATT must not fall before VDDIO.
tB’
0
CHIP_EN fall to VDDIO fall
VDDIO must not fall before CHIP_EN.
CHIP_EN and RESETN can fall simultaneously.
tC’
0
RESETN fall to VDDIO fall
VDDIO must not fall before RESETN. RESETN
and CHIP_EN can fall simultaneously.
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10.4
Digital I/O Pin Behavior During Power-Up Sequences
The following table represents digital I/O Pin states corresponding to device power modes.
Table 10-4.
Digital I/O Pin Behavior in Different Device States
Device State
VDDIO
CHIP_EN
RESETN
Output Driver
Input Driver
Pull Up/Down
Resistor (96kΩ)
Power_Down:
core supply off
High
Low
Low
Disabled (Hi-Z)
Disabled
Disabled
Power-On Reset:
core supply on, hard
reset on
High
High
Low
Disabled (Hi-Z)
Disabled
Enabled
Power-On Default:
core supply on, device
out of reset but not
programmed yet
High
High
High
Disabled (Hi-Z)
Enabled
Enabled
High
Programmed by
firmware for each
pin:
Enabled or Disabled
Opposite of
Output Driver
state
Programmed by
firmware for
each pin:
Enabled or Disabled
On_Doze/
On_Transmit/
On_Receive:
core supply on, device
programmed by firmware
11
High
High
Reference Design
The ATWINC3400 reference design schematic is shown in Figure 11-1.
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Figure 11-1.
32
ATWINC3400 Reference Schematic
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12
Reference Design Guidelines





13
RFIOP and RFION pins must be AC coupled
It is recommended that the balun is located right next to the pins – if this is not possible, RFIOP and
RFION should be routed as 50Ω differential pair to the balun
ATWINC3400 provides programmable pull-up resistors on various pins (see Table 3-1). The purpose of
these resistors is to keep any unused input pins from floating which can cause excess current to flow
through the input buffer from the VDDIO supply. Any unused pin on the device should leave these pullup resistors enabled so the pin will not float.
The default state at power up is for the pull-up resistor to be enabled. However, any pin which is used
should have the pull-up resistor disabled. The reason for this is that if any pins are driven to a low level
while the device is in the low power sleep state, current will flow from the VDDIO supply through the pullup resistors, increasing the current consumption of the module.
Since the value of the pull-up resistor is approximately 100KΩ, the current through any pull-up resistor
that is being driven low will be VDDIO/100K. For VDDIO = 3.3V, the current would be approximately
33µA.
Pins which are used and have had the programmable pull-up resistor disabled should always be actively
driven to either a high or low level and not be allowed to float
If SDIO interface is used, each SDIO pin should use a 70Ω resistor in series for RF noise filtering
Refer to ATWINC3400 Programming Guide for information on enabling/disabling the programmable pullup resistors
Reference Documentation and Support
Atmel offers a set of collateral documentation to ease integration and device ramp.
The following list of documents available on Atmel web or integrated into development tools.
Title
Content
Datasheet
This Document
Design Files
Package
User Guide, Schematic, PCB layout, Gerber, BOM and System notes on: RF/Radio Full Test Report,
radiation pattern, design guidelines, temperature performance, ESD.
Platform Getting
Started Guide
How to use package: Out of the Box starting guide, HW limitations and notes, SW Quick start guidelines.
HW Design
Guide
Best practices and recommendations to design a board with the product.
Including: Antenna Design for Wi-Fi (layout recommendations, types of antennas, impedance matching, using a power amplifier etc.), SPI/UART protocol between Wi-Fi SoC and the Host MCU.
SW Design
Guide
Integration guide with clear description of: High level Arch, overview on how to write a networking
application, list all API, parameters and structures.
Features of the device, SPI/handshake protocol between device and host MCU, with flow/sequence/state diagram, timing.
SW Programmer Guide
Explain in details the flow chart and how to use each API to implement all generic use cases (e.g.
start AP, start STA, provisioning, UDP, TCP, http, TLS, p2p, errors management, connection/transfer
recovery mechanism/state diagram) - usage and sample application note.
For a complete listing of development-support tools and documentation, visit http://www.atmel.com/, or contact
the nearest Atmel field representative.
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14
Revision History
Doc Rev.
34
Date
Comments
42396C
07/2015
1. Modified sections 10.2.1 and 10.2.2 to add new current consumption numbers, update
state names, and correct some typos
2. Fixed typos for SPI Slave interface timing (Table 9-6)
3. Fixed typos for battery supply name: changed from VBAT to VBATT
4. Corrected PMU output voltages (Table 10-1)
5. Updated reference schematic drawing (Section 11)
6. Added comment regarding resistors on SDIO pins (Section 12)
7. Replaced Bluetooth with BLE throughout the document, updated content accordingly
8. Removed PCM functionality
9. Added back SDIO interface description (Section 9.5)
10. Updated power architecture drawing (Section 10.1)
11. Added pad drive strength in Table 4-3 and removed the note under Table 3-1
12. Updated operating temperature in the feature list
13. Corrected current in Power_Down state in Table 10-2
14. Miscellaneous minor formatting and content corrections
42396B
03/2015
Ordering information (Table 1-1) and QFN Package Information (Table 3-2) have been
corrected.
42396A
02/2015
Initial document release.
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