NM1 Module Datasheet

Last Updated on : 2020-08-12 08:42:07download

Product Overview

NM1 is a low-power embedded LPWA module in the NB-IoT series that Tuya has developed. It supports the NB-IoT radio communication protocol (3GPP Rel.13). NM1 contains a highly integrated Soc MT2625 ( which is internally embedded with an application processor, a low-power multi-band NB-IoT transceiver and a power management unit (PMU)) and a few peripherals. NM1 further contains an embedded low-power 32-bit central processing unit (CPU), is integrated with a 32Mb pseudo static random access memory (PSRAM), 32Mb flash memory, and supports interfaces including UART, I2C, SPI, PWM, ADC, USB、keyboard, and USIM.


  1. Embedded low-power 32-bit ARM Cortex-M4 processor
  2. Power supply voltage
    • Working voltage: 2.1 to 3.63 V
    • Typical working voltage: 3.3 V
  3. Peripherals: 26 GPIOs, 3 universal asynchronous receiver/transmitters (UART), 4 pulse width modulations (PWM), 1 analog-to-digital converter (ADC), 1 serial peripheral interface (SPI) and 1 inter-integrated circuit (I2C)
  4. SIM: 3V/1.8V SIM card
  5. USB interface: USB 1.1
  6. NB-IoT network
    • Cat NB1/Cat NB2
    • B1/B2*/B3/B5/B8/B12*/B13*/B17*/B18*/B19*/B20/B25*/B26*/B28*/B66*
    • Maximum transmit power: 23 dBm±2 dB
    • Receiving sensitivity <-123dBm/15kHz (not retransmission)
      • 50Ω characteristic impedance, an antenna provided by the third party
      • Data rate: Single-tone: 25.5 kbps (downlink) and 16.7 kbps (uplink) Multi-tone: 25.5 kbps (downlink) and 62.5 kbps (uplink)
      • Network protocol feature: UDP/TCP/CoAP/LWM2M/ PPP*/SSL*/DTLS*/FTP*/ HTTP*/MQTT*/HTTPS*
      • Normal working temperature: -35°C to +75°C
        Extended working temperature: -40°C to +85℃
        Storage temperature: -40°C to +90℃
  7. Upgrade through the main serial interface FOTA


  • Public utilities: meter reading (water, gas and electricity), intelligent water affairs (pipe network, leakage and quality inspection), smart fire extinguisher, fire hydrant, etc.
  • Smart health: drug traceability, remote medical monitoring, blood pressure meter, blood glucose meter, heart armor monitoring, baby monitor, etc.
  • Smart city: smart street lights, smart parking, urban trash can management, public safety alarms, urban environment monitoring (water pollution, noise, air quality PM2.5, etc.)
  • Consumers: wearable devices, bicycles, mopeds anti-theft, smart luggage, VIP tracking (children, elderly, pets and vehicle rental), and payment/POS machines
  • Agricultural environment: precision planting (environment parameters: water, temperature, sunshine, biocide and fertilizer), animal husbandry (health and tracking), aquaculture and food safety traceability
  • Logistics warehousing: asset, container tracking, warehouse management, fleet management tracking, and logistics status tracking
  • Smart building: access control, smart HVAC, smoke detection, fire detection and elevator failure/repair
  • Manufacturing industry: production, equipment status monitoring, energy facilities, oil and gas monitoring, chemical park monitoring, large-scale rental equipment and predictive maintenance (home appliances, machinery, etc.)

Change History

Serial NumberUpdate DateUpdated ContentVersion after Update
107/18/2019This is the first release.V1.0.0

Module Interfaces

Pin Distribution

NM1 has 66 pins in total. Among them, there are 52 LCC pins and 14 LGA pins. This part illustrates module interfaces and their definitions in details. NM1 Module Datasheet

Pin Definition

Pin NumberSymboI/O TypeFunctionsRemarks
2GPIO0IGPIO01.8V, GPIO0 needs to be pulled down to the low level in the USB download mode
3SPI_MISOIMaster input slave output/GPIO141.8V, support only the slave mode
4SPI_MOSIOMaster output slave input/GPIO131.8V, support only the slave mode
5SPI_SCLKOSerial clock signal/GPIO151.8V, support only the slave mode
6SPI_CSOChip selection signal/GPIO121.8V, support only the slave mode
7PWRKEYIPull down PWRKEY to start the moduleV IL max=0.3VBAT and V IH min=0.7VBAT
9ADC0IA universal analog-to-digital converter0 to 1.4V (by default, firmware does not support ADC0)
10SIM_GND--A SIM card dedicated place--
11SIM_DATA--A SIM card data signalV IL max=0.25SIM_VDD, V IH min=0.75SIM_VDD, V OL max=0.15SIM_VDD, V OH min=0.85SIM_VDD
12SIM_RST--SIM card reset signalV OL max=0.15SIM_VDD, V OH min=0.85SIM_VDD
13SIM_CLK--SIM card clock signalV OL max=0.15SIM_VDD, V OH min=0.85SIM_VDD
14SIM_VDD--SIM card power supply--
15RESETIReset module3.3V, active low
16NETLIGHTI/OGPIO20A universal GPIO interface If you need the network indication function, the pin is recommended
17UART0_RXDIA main serial port, which is used for receiving data1.8V Please pay attention to reference level conversion
18UART0_TXDOA main serial port, which is used for transmitting data1.8V Please pay attention to reference level conversion
19PSM_EINTIAn external interrupt pin, which can wake up the module in the PSM mode3.3V, active low
20SRCLKENAI--NFC interface--
21USB_DP--USB data positive signalUSB download, PIN 63 needs the voltage of 3.3V
22USB_DM--USB data minus signalU B download, PIN 63 needs the voltage of 3.3V
24VIO18_EXTO1.8V output power supply (no output in PSM mode)Vmin=1.53V, Vnorm=1.8V
28UART1_RXDIA default universal docking user serial interface, which is used for receiving data1.8V Please pay attention to reference level conversion
29UART1_TXDOA default universal docking user serial interface, which is used for transmitting data1.8V Please pay attention to reference level conversion
30UART1_CTS--Whether to receive data1.8V Please pay attention to reference level conversion
31UART1_RTS--Whether to transmit data1.8V Please pay attention to reference level conversion
32I2C0_SDAI/OI2C0_data/GPIO7A default I2C interface
33I2C0_SCLOI2C0_clock/GPIO6A default I2C interface
35RF_ANT--RF_antenna50Ω characteristic impedance
36, 37GND--GND--
38UART2_RXDIReceive dataBy default, it is log serial interface. 1.8V Please pay attention to the reference level conversion
39UART2_TXDOTransmit dataBy default, it is log serial interface. 1.8V Please pay attention to the reference level conversion
40, 41GND--GND--
42VSYS_BBIInput power supplyV=2.1 to 3.63V, Vnorm=3.3V
43VBAT_BOOSTIInput power supplyV=2.1 to 3.63V, Vnorm=3.3V
44VSYS_PAOOutput power suppl3.3V
60RTC_GPIO0--DCDC ENABLENot recommended for external use
61SIM_DET*--GPIO35SIM card detection pin, currently not supported
63AVDD33_VUSBIInternal USB power supplyThe voltage of 3.3V
64FREF--Reference frequency--

Note: “*” indicates “still under development” and “currently not supported”.

Electrical Parameters

Absolute Electrical Parameters

ParameterDescriptionMinimum valueMaximum ValueUnit
TsStorage temperature-4090
VBATPower supply voltage2.13.63V
Contact dischargeVBAT, GND-5+5KV
Contact dischargeAntenna interface-5+5KV
Contact dischargeOther interfaces-0.5+0.5KV
Air dischargeVBAT, GND-10+10KV
Air dischargeAntenna interface-10+10KV
Air dischargeOther interfaces-1+1KV

Normal Working Conditions

ParameterDescriptionMinimum valueTypical ValueMaximum ValueUnit
TaWorking temperature-352575
VBATPower supply voltage2.13.33.63V
VILIO low level output-0.3-VCC*0.25V
VIHIO high level inputVCC*0.75-VCCV
VOLIO low level output--VCC*0.1V
VOHIO high level outputVCC*0.8-VCCV
ImaxIO drive current--12mA

TX and RX Power Consumption:

Working ModeDescriptionAverage ValuePeak Value (Typical Value)Unit
PSMDeep Sleep3/μA
Single-tone carrier frequency of 15kHzB1@23 dBm99280mA
Single-tone carrier frequency of 15kHzB3@23 dBm106310mA
Single-tone carrier frequency of 15kHzB5@23 dBm105305mA
Single-tone carrier frequency of 15kHzB8@23 dBm108320mA
Single-tone carrier frequency of 15kHzB20@23 dBm109300mA
Single-tone carrier frequency of 3.75kHzB1@23 dBm193300mA
Single-tone carrier frequency of 3.75kHzB3@23 dBm212332mA
Single-tone carrier frequency of 3.75kHzB5@23 dBm213330mA
Single-tone carrier frequency of 3.75kHzB8@23 dBm224342mA
Single-tone carrier frequency of 3.75kHzB20@23 dBm217325mA

RF Parameters

Basic RF Features

Working frequencyBand 1: 1920-1980MHz; 2110-2170 Mhz Band 3: 1710-1785Mhz; 1805-1880 Mhz Band 5: 824-849 Mhz; 869-894 Mhz Band 8: 880-915 Mhz; 925-960 Mhz Band 20: 832-862 Mhz; 791-821 MHz
NB-IoT standards3GPP 36.521
6.2.2F UE maximum output power for category NB1
6.2.3F maximum power reduction (MPR) for category NB1
6.2.5F configured UE transmitted output power for UE category NB1
6.3.2F minimum output power for category NB1
6.3.3F transmit off power for category NB1
6.3.4 F1 ON/OFF time mask for category NB1
6.3.4.F2 NPRACH time mask for category NB1
6.3.5F.2 power control relative power tolerance for category NB1
6.3.5F.1 power control absolute power tolerance for category NB1
6.5.1F frequency error for category NB1 error vector magnitude (EVM) for category NB1 carrier leakage for category NB1 in-band emissions for non-allocated RB for category NB1
6.6.1F occupied bandwidth for category NB1 spectrum emission Mask for category NB1 adjacent channel leakage power ratio for category NB1
7.3F.1 reference sensitivity level without repetitions for category NB1
7.4F maximum input level for category NB1
Data transmission rateSingle-tone: 25.5 kbps (downlink), 16.7 kbps (uplink) Multi-tone: 25.5 kbps (downlink), 62.5kbps (uplink)
Antenna typeAntenna provided by the third party (external antenna, FPC antenna, etc.)

TX Performance

TX Performance

Frequency BandMinimum valueMaximum ValueUnit
B1<-3923 dBm±2 dBdBm
B3<-3923 dBm±2 dBdBm
B5<-3923 dBm±2 dBdBm
B8<-3923 dBm±2 dBdBm
B20<-3923 dBm±2 dBdBm

RX Performance

RX sensitivity

Frequency BandTypical ValueUnit
Band 1-123.8 dBm/15 kHzdBm
Band 3-123.8 dBm/15 kHzdBm
Band 5-123.8 dBm/15 kHzdBm
Band 8-123.8 dBm/15 kHzdBm
Band 20-123.8 dBm/15 kHzdBm

Antenna Information

Antenna Type

The module does not have its own PCB board antenna, and the third party needs to provide an antenna. The antenna can be an external rod antenna, a spring antenna, an IPEX-FPC antenna, a PCB board antenna, etc. The antenna forms include monopole antenna, PIFA antenna, IFA antenna, loop antenna, etc.

NM1 Module Datasheet

NM1 Module Datasheet

NM1 Module Datasheet

Antenna Interference Reduction

To ensure optimal NB-IoT performance, it is recommended that the antenna be at least 10mm away from other metal parts.

Packaging Information and Production Instructions

Mechanical Dimensions

NM1 has 66 pins in total. 52 pins are LCC package, and 14 pins are LGA package.
The NM1 dimensions are 17.7 mm (L)×15.8 mm (W) ×2.4 mm (H), which are shown as belows:

NM1 Module Datasheet NM1 Module Datasheet

Side View

NM1 Module Datasheet

The Schematic Diagram of Packaging

NM1 Module Datasheet

The Diagram of PCB Packaging-SMT

NM1 Module Datasheet

Top/Bottom/Side View of the Module

NM1 Module Datasheet NM1 Module Datasheet

Note: The module length and width tolerance is ±0.35mm, the height tolerance is ±0.2mm, and the PCB thickness tolerance is ±0.1mm. If you have specific requirements on dimensions, make them clear in the datasheet after communication.

Production Instructions

  1. Tuya's stamp hole package module must be mounted by SMT machine within 24 hours after unpacking and programming of firmware. Otherwise, it must be packaged again under vacuum. The module must be baked before mounting.
    A. SMT equipment
    a) Reflow soldering machine
    b) Automated optical inspection (AOI) equipment
    c) Nozzle with a 6 mm to 8 mm diameter B. Baking equipment
    a) Cabinet oven
    b) Anti-static heat-resistant trays c) Anti-static heat-resistant gloves
  2. Storage conditions for a delivered module are as follows:
    A. The moisture-proof bag must be placed in an environment where the temperature is below 30°C and the relative humidity is lower than 70%.
    B. The shelf life of a dry-packaged product is 6 months from the date when the product is packaged and sealed.
    C. The package contains a humidity indicator card (HIC).
    NM1 Module Datasheet
  3. Bake a module based on HIC status as follows when you unpack the module package:
    A. If the 30%, 40%, and 50% circles are blue, bake the module for 2 consecutive hours.
    B. If the 30% circle is pink, bake the module for 4 consecutive hours.
    C. If the 30% and 40% circles are pink, bake the module for 6 consecutive hours.
    D. If the 30%, 40%, and 50% circles are pink, bake the module for 12 consecutive hours.
  4. Baking settings:
    A. Baking temperature: 125±5°C
    B. Alarm temperature: 130°C
    C. SMT ready temperature after natural cooling: < 36°C
    D. The number of drying times: 1
    E. Rebaking condition: The module is not soldered within 12 hours after baking.
  5. Do not use SMT to process modules that have been unpacked for more than 3 months, because electroless nickel/immersion gold (ENIG) is used for PCBs and they are seriously oxidized after more than 3 months. SMT is very likely to cause pseudo and missing soldering. Tuya is not liable for such problems and consequences.
  6. Before SMT, take electrostatic discharge (ESD) protective measures.
  7. To reduce the reflow defect rate, draw 10% of the products for visual inspection and AOI before the first mounting to determine proper methods for controlling the oven temperature and attaching and placing components. Draw 5 to 10 modules from subsequent batches each hour for visual inspection and AOI.

Recommended Oven Temperature Curve

Perform SMT based on the following reflow oven temperature curve. The highest temperature is 245°C. The reflow temperature curve is shown as belows:

NM1 Module Datasheet

Storage Conditions

NM1 Module Datasheet

MOQ and Packaging Information

Product NumberMOQ (pcs)Shipping packaging methodThe number of modules per reel (pcs)The number of reels per carton (reel)
NM13600Tape reel9004
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