Hologram Dash data sheet

The Dash v1.2 is a fully open source reference design and prototyping platform for developers to rapidly test and move applications to market. The Dash helps developers makes connectivity simple and enables embedded applications to interface with other peripherals and sensors through an array of GPIO, serial interfaces, and analog pins. The on-board microcontrollers and battery management ICs make the Dash are ideal for low-power, low data usage applications.

Note: The Hologram Dash is no longer in production.


System block diagram

system block diagram

Pinout diagram

pinout diagram


The Dash uses two microcontrollers:

The System microcontroller is Freescale's MKL17Z256VFM4 which features a 32-bit ARM Cortex-M0+ that runs at 48 MHz and has 256 kB Flash and 32 kB RAM. This microcontroller manages the u-blox modem as well as connections into Hologram's cloud.

User microcontroller

The User microcontroller is Freescale's MK22FN1M0AVLH12 which features a 32-bit ARM Cortex-M4 that runs at 120MHz and has 1MB Flash and 256kB RAM. This microcontroller exclusively hosts user programs that are fully compatible with Arduino APIs. (Note: although our firmware is fully Arduino-compatible, when loading Arduino libraries on the Dash, it is important to check the library for hardware-specific calls. In these cases these libraries will not be compatible with the Dash out of the box.)

Open source hardware

Hologram is committed to providing open source hardware to enable developers looking for a field-tested and readily scalable reference design.

The Dash v1.2 is certified by the OSHWA (Open Source Hardware Association) under identifier US000082. The design can be modified and adapted to any application (commercial or otherwise).


Power Input/Output Characteristics

The Dash v1.2 can be powered using the USB5V, VBATT, or SystemVin pins. The Dash v1.2 can power other peripherals through the VSystemUser and 3.3V pins. Allowable minimum and maximum voltage and current for these power inputs and power outputs is listed below.

Symbol Description Min Typical Max
USB_5V USB 5V input 4.75V 5V 5.25V / 2.1A
VBATT Battery input 2.0V @ 0.1mA 4.2V 200mA
3.3V 3.3V output   3.3V 3.32V / 250mA
SystemVin 5V input 4.75V 5V 7V / 1.8A
VSystem_User 5V output     VSystem-.7* / 250mA**

*System_User is a reference to the internal 5V power supply, protected by an input diode.

** Current draw by peripherals on this pin should be limited to 250mA to maintain normal operation of internal Dash components.

Peripherals and GPIO

Peripherals and GPIO on the Dash v1.2 minimum and maximum voltages are listed below. The Dash user microcontroller works at 3.3V (i.e. 3.3V registers as a “1” for digital GPIO and analog input) and the digital pins are 5V tolerant whereas the analog pins are 4.1V tolerant.

  # of pins Input/Output Min Max
DIGITAL GPIO 25 Both -0.3 5.5V
ADC 10 Input -0.3 4.1V
DAC 1 Output 0 3.3V
I2C 2 Both -0.3 5.5V
UART 2 Both -0.3 5.5V
SPI 2* Both -0.3 5.5V
CAN 1 Both -0.3 5.5V

*Denotes single SPI with 2 configurations

Power management

Deep sleep

The Dash has three different power operating modes that are configurable via API:

  • Normal (default): Both microcontrollers are running at standard clock rates (48MHz and 120MHz for the System and User microcontrollers, respectively) and the u-blox modem is on. The User modem can be configured for 120MHz, 100MHz, or 48MHz.
  • Sleep: Instruction clock is paused and peripherals and interrupts remain active.
  • deepSleep: Lowest possible power mode on the Dash. Most peripherals and interrupts are disabled, only select wake-up interrupts can wake from deepSleep (select I/O pins, alarm) when configured. The system microcontroller, user microcontroller, and u-blox modem can be placed into deepSleep independently. Hologram has verified, lab-observed deepSleep current of 350uA.

Battery charging

Battery charging is automatically managed by the MCP73871-2CCI/ML IC.

The details for the MCP73871-2CCI/ML can be found on the datasheet.

Radio specifications

The Dash v1.2 features the global band SARA-U201 or the global band SARA-R410M depending on 3G/2G or Cat-M/NB-IoT variant, respectively. Both of these modems are considered global band and work anywhere we have 2G/3G or Cat-M1 coverage, respectively.

The SARA-U201 modem supports a global list of 2G and 3G frequencies:

3G Bands
  • Americas: Band 5 (850MHz), Band 2 (1900MHz)
  • Europe/Asia/Africa: Band 8 (900MHz), Band 1 (2100MHz)
2G Bands
  • GSM - 850MHz
  • E-GSM - 900MHz
  • DCS - 1800 MHz
  • PCS - 1900 MHz

The SARA-R410M modem supports a global list of Cat-M1 and NB-IoT bands:

  • 1, 2, 3, 4, 5, 8, 12, 13, 17, 18, 19, 20, 25, 26, 28 (and band 39 in M1-only)

These bands correspond to Uplink and Downlink frequencies in the following ranges (in MHz):

  • 700, 800, 850, 900, 1700, 1800, 1900, 2100

The full list of bands and frequencies can be found in the u-blox SARA datasheet.

Mechanical dimensions

mechanical dimensions diagram

LEDs and buttons

The Dash includes 3 different LEDS and two different buttons:

Reset Button:Resets the user microcontroller.

Program Button:used to put Dash into programming mode.

Program LED:flashes when the Dash is in programming mode

Program LED

User LED:full configurable by user programs using the Arduino IDE

User LED

RGB LED:configurable by user programs

Read more about configuring both User and RGB LEDs in our Dash API reference.


The Dash is made for ultimate flexibility and this extends to the antenna. The stock black antenna has the following characteristics:

  • Size(main radiator): 2cm x 7cm
  • Size(cable length): 10cm
  • Connector:UFL
  • Mounting:Adhesive 3M tape
  • Temperature:-40C - +85C
  • VSWR:824MHz - 960MHz: < 3 | 1710MHz - 2170MHz: < 3
  • Impedance:50ohm

Bill of materials

Designator Comment MPN
C2, C3, C4, C6, C7, C8, C9, C12, C14, C15, C18, C24, C25, C26, C48 0.1 uF GRM155R61C104KA88D
C16, C20, C49 1 uF 04026D105KAT2A
C1 1 uF GRM188R71C105KA12D
C10, C11, C13, C28 2.2 uF CL10A225MQ8NNNC
C27, C39 10 nF GRM155R71C103KA01D
C33, C34 10 uF GRM188R60J106ME84D
C46 15 pf 04025A150JAT2A
C36, C37, C38 22 uF GRM188R60J226MEA0D
C41, C42, C44, C45 47 pF 04025A470JAT2A
C40 56 pf C0402C560J5GACTU
C47 330uF F950J337MBAAQ2
X2, X3 32.768 kHz ABS05-32.768KHZ-T
U3, U4 CDBQR0230L CRS08(TE85L,Q,M)
L1, L2, L3, L7 FerriteBead_220ohm BLM18AG121SN1D
F6 3A SF-0603S300-2
L5 1uH XFL4020-102MEC
D1, D7 LED_0402_VLMW VLMW1500-GS08
D2 LED_RGB_1mm_sq SMLP34RGB2W3
U19 MAX1704X MAX17043G+U
U10   NCP177AMX330TCG
D3, D4, D5, D6, D9, D10, D11   PESD0402-140
R66 0 ERJ-2GE0R00X
R45 1k RC0402JR-071KL
R13 1M RC0402FR-071ML
R8 2k RC0402FR-072KL
R24, R35, R36, R37, R38, R40, R47, R2000 10K RC0402JR-0710KL
R1, R2 22 RC0402FR-0722RL
R7 62k RC0402FR-0762KL
R26, R65 75 RC0402FR-0775RL
R51 100K ERJ-2GEJ104X
R21 120 ERJ-2GEJ121X
R12 150k RC0402FR-07150KL
R22 160 ERJ-2GEJ161X
R19, R20 470 ERJ-2GEJ471X
U420 SARA-U2XX SARA-U201-00S
SIM1 SIM_CARD_NANO SIM8050-6-0-14-01-A
U9   TPS22945DCKR
U2 TPS63020 TPS63020DSJ
J1 Micro USB B FCI 10118193 10118193-0001LF
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