> For the complete documentation index, see [llms.txt](https://nucode.gitbook.io/nuseries/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://nucode.gitbook.io/nuseries/modules/nu-40.md).
# NU-40
**CONTENTS** [Downloads](#downloads) | [Realistic View](#realistic-view) | [Functional Description](#funtional-description) | [Pin Layout](#pin-layout)
***
## **Downloads**
## **Funtional Description**
* ### **Features**
**CPU**
* nRF52840 with embedded 1 MB Flash, 256 KB RAM, ARM Cortex-M4 32-bit processor with FPU, 64MHz
**Bluetooth® LE**
* Bluetooth® Low Energy 5.4 compatible 2.4 GHz radio
* 95 dBm sensitivity in 1 Mbps Bluetooth LE mode
* Receiver sensitivity down to -95 dBm in 1 Mbps mode and -103 dBm in 125 kbps Long Range mode
* Programmable transmit power from -20 dBm to +8 dBm
* Supports 2 Mbps, 1 Mbps, 500k bps and 125 kbps Bluetooth® LE
**NFC**
* Supports NFC-A tag interface with wake-on-field operation for touch-to-pair use cases
**Power Management**
* Supply voltage range 1.7V to 5.5V
* On-Chip DC/DC and LDO regulators with automated low current modes
* Regulated supply for external components from 1.8V to 3.3V
* 1 KB retention SRAM available in deep-sleep mode
* Fast wake-up using 64 MHz internal oscillator
**Peripherals**
* SPI, TWI, UART, PWM, PDM, I2S, ADC
* ### **Application**
* NU-40 is available in a variety of applications, including:
* Advanced computer peripherals and I/O devices
* Mouse
* Keyboard
* Multi-touch trackpad
* Advanced wearables
* Health/fitness sensor and monitor devices
* Wireless payment enabled devices
* Internet of things (IoT)
* Smart home sensors and controllers
* Industrial IoT sensors and controllers
* Interactive entertainment devices
* Remote controls
* Gaming controllers
## **Pin Layout**
No.
Name
Function
1
P1.10
I/O
2
P1.13
I/O
3
P1.15
I/O
4
P0.02 / AIN0
I/O
5
P0.28 / AIN4
I/O
6
P0.29 / AIN5
I/O
7
P0.30 / AIN6
I/O
8
P0.31 / AIN7
I/O
9
P0.00 / XL1
I/O
10
P0.01 / XL2
I/O
11
GND
Power
12
GND
Power
13
GND
Power
14
VDD
Power
15
VDD
Power
16
P0.26
I/O
17
P0.27
I/O
18
P0.04 / AIN2
I/O
19
P0.05 / AIN3
I/O
20
P0.06
I/O
21
P0.07
I/O
22
P0.08
I/O
23
P1.08
I/O
24
P1.09
I/O
25
P0.11
I/O
26
P0.12
I/O
27
VDDH
Power
28
DCCH
Power
29
GND
Power
30
VBUS
Power
31
DECUSB
Power
32
D-
I/O
33
D+
I/O
34
P0.13
I/O
35
P0.14
I/O
36
P0.15
I/O
37
P0.16
I/O
38
P0.17
I/O
39
P0.20
I/O
40
P0.22
I/O
41
P0.24
I/O
42
P1.00
I/O
43
P1.01
I/O
44
SWDIO
I/O
45
SWDCLK
Input
46
GND
Power
47
P1.02
I/O
48
P1.03
I/O
49
P1.04
I/O
50
P1.05
I/O
51
P1.06
I/O
52
P1.07
I/O
53
P0.09 / NFC1
I/O
54
P0.10 / NFC2
I/O
55
P1.11
I/O
56
P1.12
I/O
57
P1.14
I/O
58
P0.03 / AIN1
I/O
59
P0.18 / RESET
I/O
60
P0.19
I/O
61
P0.21
I/O
62
P0.23
I/O
63
P0.25
I/O
64
GND
Power
65
GND
Power
66
GND
Power
67
GND
Power
68
GND
Passive
69
GND
Passive
70
GND
Passive
71
GND
Passive
72
GND
Passive
73
GND
Passive
74
GND
Passive
75
GND
Passive
76
GND
Passive
77
GND
Passive
78
GND
Passive
79
GND
Passive
80
GND
Passive
81
GND
Passive
82
GND
Passive
83
GND
Passive
84
GND
Passive
{% hint style="warning" %}
· Dedicated functions such as analog inputs and the 32.768 kHz low-frequency crystal are limited to specific pins.
· Analog signals shall be connected to AIN0–AIN7 pins, and an external 32.768 kHz crystal shall be connected to XL1 and XL2.
{% endhint %}
