NB1A Microcontroller Board
The NB1A is a physical computing development system that is compatible
with the Arduino software environment. For system development a
variety of peripheral modules are available. All of the ZB1 peripherals
are compatible with the NB1A. The datasheet
is located
here
Features
- Replaceable and upgradeable CPU
- Compatible with the Arduino development tools.
- ATmega328 running at 12MHz with a Vcc of 3.3V.
- 4.4" x 1.75"
- Atmega I/O connections are wired to a single 26 pin header. DAC
and RTC interrupt output lines are wired to an 8 pin
header. Application boards can be mounted parallel using vertical
connectors, co-planar using right-angle connectors or remotely
using a flexible cable.
- DAC Features
- Four channels, eight bits per channel.
- Reference -- 1.24V, ±0.5% (initial accuracy), 50ppm/°C typical drift,
140ppm/°C max drift,
- SPI Interface
- RTC Features
- Real-Time Clock (RTC) Counts Seconds,
Minutes, Hours, Day, Date, Month, and Year
with Leap-Year Compensation Valid Up to
2100
- Two Time-of-Day Alarms
- Programmable Square-Wave Output
- Powered by a CR1220 coin cell.
- I2C Serial Interface
- The board can be built with either a USB interface
or with a six pin header for use with an USB to serial cable.
The USB interface circuitry includes transient
suppression.
- ICSP port (3.3V levels)
- A/D reference supply filtered per Atmel specification.
- Reset circuit per Atmel specification.
- Power supply is jumpered between either an LDO or an external
3.3V supply. The LDO input is diode or'ed from a wall adapter or the
USB 5V supply.
- Compatible with the ZB1 accessories which include an LCD interface board and
a prototyping board.
Non-catastrophic Infelicities
There are two known fabrication mistakes on the NB1A Rev1 PCB. These
are minor mistakes that affect the assembly of the board not the
functionality.
Perform these reworks prior to starting the
assembly procedure documented in the datasheet.
- The diameter of the drill holes for the watch crystal
(
X21) are ≈3mils too small. Although some
combinations of crystal leads and PCB holes will have sufficient
clearance for assembly most will not. The hole has been re-drilled to
a diameter of 16mils. You should top and bottom solder the leads since
the hole may no longer be plated through.
- The connection from R21 to Vcc is missing (left side of the
resistor). To connect R21 to the Vcc copper plane scrape the solder
mask with an X-acto knife, bend the R21 lead and solder. You will
need a fair amount of flux since the plane has a large thermal mass.
NB1A Pricing
The NB1A PCB contains two minor mistakes that affect the assembly
of the board. Please review these issues prior to ordering. PCBs
cannot be returned for either of these two known issues.
Assembled boards are assembled to order and typically ship within one business day.
| Part Number
| Description
| Price | Qty
|
|
| NB1A-KIT2
| datasheet
| NB1A, TH Kit, USB Header
| 20.00USD | | 1
|
|
|
| NB1A-KIT3
| datasheet
| NB1A, TH + SMD Kit
| 25.00USD | | 1
|
|
|
Accessories
The FTDI USB to Serial Cable
TTL-232R-3V3 is required to program
the NB1A built with NB1A-KIT2. NB1A-KIT3 includes the surface mount components
to build the on-board USB interface.
| Part Number
| Description
| Price | Qty
|
|
| FTDI-TTL-232R-3V3
| datasheet
| USB to RS232 (3.3V TTL)
| 20.00USD | | 1
|
|
|
NB1A-KIT2 Component List
| Item Number
| Quantity
| Description
|
|
| 1
| 1
| connector, battery, CR1220
|
| 2
| 5
| capacitor, ceramic, 0.1uF, 10%, 50V, X7R
|
| 3
| 2
| capacitor, ceramic, 20pF
|
| 4
| 2
| capacitor, Nichicon UPW1E100MDD
|
| 5
| 1
| diode, dual, On-Semi MBR1545CTG
|
|
| 6
| 1
| LED, T1, Green
|
| 7
| 1
| diode, 1N4148
|
| 8
| 1
| fuse, 0.5A 1812
|
| 9
| 1
| header, RA, 13x2, 100mils
|
| 10
| 2
| header, 3x1, 100mils
|
|
| 11
| 1
| header, 6x1, 100mils
|
| 12
| 1
| header, 3x2, 100mils
|
| 13
| 1
| power jack, 2.1mm
|
| 14
| 1
| header, RA, 4x2, 100mils
|
| 15
| 1
| inductor, 10uH, 10%
|
|
| 16
| 1
| resistor, 10K, 1/4W, 1%
|
| 17
| 1
| resistor, 220 Ohm, 1/4W, 1%
|
| 18
| 1
| resistor, 200, 1/4W, 1%
|
| 19
| 2
| resistor, 4.75K, 1/4W, 1%
|
| 20
| 1
| pushbutton
|
|
| 21
| 1
| switch, CK JS202011CQN
|
| 22
| 1
| Atmel_ATmega328P-20PU
|
| 23
| 1
| voltage regulator, 3.3V, 800mA, TO-220
|
| 24
| 1
| IC, DAC, TLV5620, 4ch, 8bit, DIP-16
|
| 25
| 1
| IC, TLV431B, 1.24V, 0.5%, TO-92
|
|
| 26
| 1
| IC, RTC, DS1337+
|
| 27
| 1
| crystal, 12MHz, 20pF, HC49US
|
| 28
| 1
| crystal, 32.768KHz, 6pF, 2x6mm package
|
| 29
| 1
| DIP Socket, 8 Pin, 300mil centers
|
| 30
| 1
| DIP Socket, 14 Pin, 300mil centers
|
|
| 31
| 1
| DIP Socket, 28 Pin, 300mil centers
|
| 32
| 1
| Shunt
|
| 33
| 1
| Shunt with handle
|
| 34
| 1
| wiblock_NB1A-PCB
|
|
NB1A-KIT3 Component List
| Item Number
| Quantity
| Description
|
|
| 1
| 1
| connector, battery, CR1220
|
| 2
| 6
| capacitor, ceramic, 0.1uF, 10%, 50V, X7R
|
| 3
| 2
| capacitor, ceramic, 20pF
|
| 4
| 2
| capacitor, Nichicon UPW1E100MDD
|
| 5
| 3
| capacitor, ceramic, 0.1uF, 16V, 0805
|
|
| 6
| 1
| diode, dual, On-Semi MBR1545CTG
|
| 7
| 1
| LED, T1, Green
|
| 8
| 1
| diode, 1N4148
|
| 9
| 1
| fuse, 0.5A 1812
|
| 10
| 1
| header, RA, 13x2, 100mils
|
|
| 11
| 2
| header, 3x1, 100mils
|
| 12
| 1
| header, 3x2, 100mils
|
| 13
| 1
| power jack, 2.1mm
|
| 14
| 1
| header, RA, 4x2, 100mils
|
| 15
| 1
| Molex_67503-1020
|
|
| 16
| 1
| inductor, 10uH, 10%
|
| 17
| 1
| resistor, 10K, 1/4W, 1%
|
| 18
| 1
| resistor, 220 Ohm, 1/4W, 1%
|
| 19
| 1
| resistor, 200, 1/4W, 1%
|
| 20
| 2
| resistor, 4.75K, 1/4W, 1%
|
|
| 21
| 1
| resistor, 10K, 0805. 1%
|
| 22
| 1
| resistor, 4.7K, 0805, 1%
|
| 23
| 1
| Yageo_9C08052A3302FKHFT
|
| 24
| 1
| pushbutton
|
| 25
| 1
| switch, CK JS202011CQN
|
|
| 26
| 1
| Atmel_ATmega328P-20PU
|
| 27
| 1
| voltage regulator, 3.3V, 800mA, TO-220
|
| 28
| 1
| FTDI_FT232RL
|
| 29
| 1
| IC, DAC, TLV5620, 4ch, 8bit, DIP-16
|
| 30
| 1
| IC, TLV431B, 1.24V, 0.5%, TO-92
|
|
| 31
| 1
| IC, RTC, DS1337+
|
| 32
| 1
| TI_SN65220DBV
|
| 33
| 1
| crystal, 12MHz, 20pF, HC49US
|
| 34
| 1
| crystal, 32.768KHz, 6pF, 2x6mm package
|
| 35
| 1
| DIP Socket, 8 Pin, 300mil centers
|
|
| 36
| 1
| DIP Socket, 14 Pin, 300mil centers
|
| 37
| 1
| DIP Socket, 28 Pin, 300mil centers
|
| 38
| 1
| Shunt
|
| 39
| 1
| Shunt with handle
|
| 40
| 1
| wiblock_NB1A-PCB
|
|
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