524WiFi WiFi6 Mediatek DRiver 7915 2T2R Dual Band Concurrent DBDC miniPCIe module IEEE 802.11ax 2.4G / 5GHz, NPD, Pro+

524 WIFI6 2T2R DUAL BANDS DUAL CONCURRENT MPCIE CARD IEEE802.11AX / AC / A / B / G / N 2.4G / 5GHZ MT7915 + MT7975 – DRIVER 7915 NPD PRO+ WIFI 6 MODULE

MT7915+MT7975 Chipset2.4GHz max 23dBm & 5GHz max 20dBm output powerIEEE 802.11ac / ax compliant & backward compatible with 802.11ax/ac/a/b/g/n2×2 2.4G & 2×2 5G  MIMO Technology, up to 1.8Gbps Mini PCI Express edge connector

SupporttheFrequency2412MHz~2482MHz

SupporttheFrequency5180MHz~5825MHz

RoHS compliance ensure a high level protection of human health and the environment from risks that can be posed by chemicals

Supports Spatial Multiplexing,Cyclic-Delay Diversity (CDD), Low-Density Parity Check  (LDPC) Codes,Maximal Ratio Combining (MRC), Space Time Block Code (STBC)

Supports IEEE 802.11d, e, h, i, k, r, v time stamp, and w standards , WPA3 supported in latest OpenWRT.

Supports Dynamic Frequency Selection (DFS)

Cards are individually calibrated for QualityAssurance  Industrial working temperature range up to +70C ! Tested !  Comes with integrated heatsink 2,5mm and  with Pro+ Industrial grade extended temperature range and better radio signal parameters

Introduction

DR7915 is a WiFi6 Mini PCIe Module 2T2R based on Mediatek MT7915DAN which is a WiFi Mini PCIe single chip which supports 1800 (573+1201) Mbps PHY rate with PCIe2.1. It fully complies with IEEE 802.11ax/ac and IEEE 802.11 ac/a/b/g/n standards, offering feature-rich wireless connectivity at high standards, and delivering reliable, cost-effective throughput from an extended distance.

DR7915-NPD is 2 RF outputs for 2.4GHz, the other 2 RF outputs for 5GHz, and we combine 1×2.4GHz and 1x5GHz to be 1 antenna outputs and dual bands. So there are 2 antennas RF outputs with dual bands. In Linux “ifconfig” command, you can see two radios, ra0 and rai0, means you can have two radios in the meantime and dual bands dual concurrents with HW AP mode that can serve for 100+ concurrent clients connected at same time.

Optimized RF architecture and base band algorithms provide superb performance and low power consumption. Intelligent MAC design deploys a high efficient offload engine and hardware data processing accelerators which completely offloads Wi-Fi task of the host processor. MT7915DAN is designed to support standard based features in the areas of security, quality of service and international regulations, giving end users the greatest performance any time and in any circumstance.

MT7915DAN is designed to support high data throughput over WiFi. The host interface PCIe are integrated to provide stable bandwidth between the host platform and MT7915DAN.

Deep sleep mode:

Multiple power domains are implement on chip. In deep sleep mode, the PMU could be configured in a low power state to save the power consumption.

Two CPU systems: There are both 32-bits RISC MCU subsystem. The CPU has its local memory. There are several options of clock frequency to provide the optimal performance with the best power consumption. The 32-bit RISC MCU is used to do clocck control, power management, and host interface configuration. PDMA (packet DMA) engines are integrated to support on-the-fly data buffer management.

MT7915AN had the WiFi MAC and BBP subsystem and use with MT7975DN together, which provide the best-in-class radio and low power performance. And the Wi-Fi MAC and BBP subsystem and use with MT7975DN together, which provide the best-in-class radio and low power performance.

With the advent of 802.11ax/ac, multi-user MIMO (MU-MIMO) is defined. MT7915DAN supports MU-MIMO with different configurations.

MT7915DAN BLOCK DIAGRAM

FEATURES:

• 2T2R in 2.4G+2T2R in 5G with support of up to 573+1201Mbps PHY rate
• Supports 20, 40, 80 channels
• HE MCS0-11 BW20/40/80MHz with Nss=1~2
• Short Guard Interval
• Space-time block code (STBC)
• Low Density Partiy check (LDPC)
• Support digital pre-distortion to enhance PA performance
• Smoothing (channel estimation) extension to MIMO case
• DFS radar detection
• Embedded ARM Cortex R4 processor for full host CPU offload
• Embedded 32-bit RISC microprocessor
• Support STBC, LDPC, TX Beamformer and RX Beamformee
  Decoded BW20/40/80 up to 4×2 MU materix feedback
• Greenfield, mixed mode, legacy modes support
• Highly integrated RF with 40nm low power process
• Noise mitigation:
  • Supports background scan function for fast channel switching
  • Supports spectrum analysis for non-Wi-Fi signals
• Intelligent power saving
• WFA WMM, WMM PS (QoS)
• Integrate high efficiency internal 4G/5G PAs
• Intelligent Calibration (iCal) reduces the production time
• Integrate high efficiency internal 4G/5G PAs

SPECIFICATION:

Symbol	Parameter
Chipset	MT7915+MT7975
Host Interface	Mini PCI Express 2.1
Antenna Connector	2 x UF.L , the third (left) uf.l connector is for BT, not used now, for future use (BT is in the chipset)
Frequency Range	2.4GHz: 2.412GHz to 2.472GHz 5GHz: 5.180GHz to 5.825GHz
Operating Voltage	3.3V DC
Power Consumption	Power consumption maximum is 9W, average is 4 – 8W Main board Power Supply design please provide 3.3V 3A, minimum 3.3V 2.5A.
Modulation Techniques	OFDM: BPSK, QPSK, DBPSK, DQPSK, 16-QAM, 64-QAM, 256-QAM
Environmental Temperature	Operating: -40°C to 70°C, Storage: -40°C to 90°C
Environmental Humidity, non-condensing	Operating: 5% to 95%, Storage: Max. 90%
ROHS Compliance	YES
Dimensions (W×H×D)	51mm × 30mm × 5.9mm including heatsing on bottom side

 

RF Performance Table

 

 

Operating Mode	Data Rate	TX Power		Tolerance
		1 Chain	2 Chains
2.4 GHz 802.11b	11Mbps	20dBm	23dBm	±2dB
2.4 GHz 802.11g	54Mbps	17dBm	20dBm	±2dB
2.4 GHz 802.11n HT20	MCS7	17dBm	20dBm	±2dB
2.4 GHz 802.11n HT40	MCS7	14dBm	17dBm	±2dB

 

 

Operating Mode	Data Rate	RX Sensitivity	Tolerance
2.4 GHz 802.11b	11Mbps	-96dBm	±2dB
2.4 GHz 802.11g	54Mbps	-93dBm	±2dB
2.4 GHz 802.11n HT20	MCS7	-89dBm	±2dB
2.4 GHz 802.11n HT40	MCS7	-86dBm	±2dB

 

 

Operating Mode	Data Rate	TXPower		Tolerance
		1 Chain	2 Chain
5 GHz 802.11a	54Mbps	17dBm	20dBm	±2dB
5 GHz 802.11n/ac HT20	MCS8	15dBm	20dBm	±2dB
5 GHz 802.11n/ac HT40	MCS9	14dBm	17dBm	±2dB
5 GHz 802.11n/ac HT80	MCS9	11.5dBm	14.5dBm	±2dB
5 GHz 802.11n/ac HT20	MCS9	17dBm	20dBm	±2dB
5 GHz 802.11n/ac HT40	MCS9	14dBm	17dBm	±2dB
5 GHz 802.11n/ac HT80	MCS11	11dBm	14dBm	±2dB

 

 

 

 

 

 

 

Operating Mode	Data Rate	RX Sensitivity	Tolerance
5 GHz 802.11a	54Mbps	-80dBm	±2dB
5 GHz 802.11n/ac HT20	MCS8	-71dBm	±2dB
5 GHz 802.11n/ac HT40	MCS9	-68dBm	±2dB
5 GHz 802.11n/ac HT80	MCS9	-65dBm	±2dB
5 GHz 802.11n/ac HT20	MCS9	-61dBm	±2dB
5 GHz 802.11n/ac HT40	MCS9	-58dBm	±2dB
5 GHz 802.11n/ac HT80	MCS11	-55dBm	±2dB

 

 

MiniPCIe Slot Pin Assignment

 

TOP Side		Bottom Side
1	PCIE_WAKE_L	2	VCC_3V3
3	BT_PCM_DO	4	GND
5	BT_PCM_DI	6	BT_PCM_CLK
7	PCIE_CLKREQ_L	8	BT_PCM_SYNC
9	GND	10	PTA_TX
11	PCIE_REFCLK_N	12	BT_RTS
13	PCIE_REFCLK_P	14	BT_CTS
15	GND	16	PTA_RX
Mechanical key
17	NC	18	GND
19	NC	20	WIFI_EN
21	GND	22	PCIE_RST_L
23	PCIE_TX_N	24	VCC_3V3
25	PCIE_TX_P	26	GND
27	GND	28	BT_RX
29	GND	30	PTA_WLAN_ACT
31	PCIE_RX_P	32	PTA_ZB_PRI
33	PCIE_RX_N	34	GND
35	GND	36	LED_WPS
37	GND	38	LED_BT
39	VCC_3V3 (RESERVED)	40	GND
41	VCC_3V3 (RESERVED)	42	PTA_ZB_ACT
43	GND	44	LED_WIFI_2.4G
45	LED_WIFI5	46	NC
47	NC	48	NC
49	NC	50	GND
51	BT_EN	52	VCC_3V3

DR7915 can work on OpenWrt 21.02 version OS directly, no need to install the driver to support this MTK chipset.

Please check if you are able to itegrate drivers in to your system. Please check with below link to download 11ax driver.

http://wifi5.eu/dls/524wifi/WiFi6-MT7915-modules/

Application

Let’s have a look at the screenshots by using Wallys #DR4019 router board plus DR7915 DBDC Wlan module combo.

When the DR7915 is inserted into the DR40X9 board, there are 4 radios that can work at the same time, and it can be used as a soft router

As you can see on pictures attached, by using this combo,there will be 4 radios working at the same time,and you can configure each radio into AP or STA mode as you wish.

DR7915 can work on OpenWrt 21.02 version OS directly, no need to install the driver to support this MTK chipset.

We guess it would be a smart option as well to select #DR7915 for applications which require Multi-radios,soft router, Mesh,bonding etc…