CenterClick NTP200 and NTP250 Documentation - Hardware


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Hardware Overview

The NTP200 and NTP250 feature a small form-factor measuring about 4.25" x 2.5" x 1".

NTP250 Front

The front panel contains:

  • PPS and NTP LEDs
  • The command button (recessed)
  • Power and System LEDs

NTP250 Back

The back panel contains all connections:

  • DC Power input - 5.5mm/2.1mm or 5.5mm/2.5mm barrel connector
  • Ethernet - 10/100mbps
  • USB-A for offline software upgrade
  • USB-MicroB for Local Console configuration
  • GPS Antenna - SMA connector


Hardware Architecture

Block Diagram

The NTP200 and NTP250 are based on a dual PCB design as shown below. The yellow top board is an embedded ARM SoC compute module and the green base board contains power supplies the GPS module and other items. A lot of value is packed into its tiny case.

NTP250 Inside 1 NTP250 Inside 2 NTP250 Inside 3

CPU, RAM, and Storage

The NTP200 and NTP250 use a multi-core ARM SoC from Rockchip.

All NTP250's have 512MB of RAM, and most NTP200's have 256MB of RAM (in mid-summer 2021, some NTP200's shipped with 512MB due to part shortages).

All boards ship with an 8GB or 16GB MicroSD card.


GPS Module & Antennas

The NTP200 and NTP250 use a uBlox MAX-M8Q GPS Module.

An active 3.3V powered antenna is supported. The Antenna is powered as described in Figure 8 on Page 12 of the u-blox M8 Hardware Integration Manual.


USB Admin Console

The Micro-B USB connector is controlled by a WCH CH340 UART to USB adapter. This port is configured for 115200 N81 serial communication.


Power Supplies and Backup

The NTP200 takes a single external DC power supply input where as the NTP250 can be powered by dual inputs (DC input and PoE). The NTP250 has hardware fail-over between the 2 inputs. Power consumption is around 1 Watt.

The GPS module and RTC are powered by a rechargeable supercapacitor. If the power inputs are lost during a power outage or are temporarily disconnected. The GPS module will remain powered for about 5-6 hours allowing for a quick re-acquisition of the GPS signal in just seconds instead of 30-90 minutes on a cold boot. The RTC will remain powered for 2-3 days to allow for an approximate wall time on the next power on prior to GPS synchronization. The supercap will charge from 0% to 90% in about 20 minutes.

  HW Rev <= 10 HW Rev >= 11
  NTP200 NTP250 NTP200 NTP250
DC Power Input (2.1/5.5mm barrel connector) 7-14V DC
9V-1A or 12V-1A recommended
7-11V DC
9V-1A recommended
8-14V DC
9V-1A or 12V-1A recommended
802.3af/at PoE - Yes - Yes
Dual Redundant Power Inputs - Yes (DC + PoE) - Yes (DC + PoE)
Priority when both DC+PoE Powered - PoE - When DC <12V: PoE
When DC >12V: DC

Hardware Revisions

Hardware Rev 5

  • Prototype boards, identified as NTP100 and NTP150

Hardware Rev 6

  • First production boards, identified as NTP200 and NTP250
  • Considerable differences between Rev 5, too many to list

Hardware Rev 7

  • Add additional test points
  • Minor layout changes

Hardware Rev 8

  • Minor layout changes

Hardware Rev 9

  • Add DC-IN reverse polarity, over-voltage, and ESD protection
  • Improve DC-IN power supply filtering
  • Switch console UART from CH340G to CH340N
  • Add additional test points
  • Connect GPS I2C pins to CPU
  • Layout changes

Hardware Rev 10

  • Add additional test points
  • Remove extra unpopulated supercap locations
  • Layout changes

Hardware Rev 11

  • Add brownout protection on VIN
    • Increase minimum DC-IN from 7V to 8V
    • Add bulk CAP to DC-IN
  • Add PoE minimum load
    • Add PoE load when DC-IN > 11.5V
    • Increase maximum DC-IN for NTP250 from 11V to 14V
  • Decrease brightness of on-board 5V and 3V3 LEDs
  • Increase supercap charging rate by 20%
  • Add dual-footprint alternative PoE power module due to part shortages
  • Add dual-footprint console UART (CH340N or CH340K) due to part shortages
  • Add ESD protection to GPS antenna connector
  • Layout changes

Hardware Rev 12

  • Improve filter on DC-IN
  • Layout changes

Hardware Rev 13

  • Minor footprint changes

Hardware Rev 14

  • Add additional test points


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