Datasheet
Alameda connects to Pmod-compatible field-programmable gate array
(FPGA)/microcontroller development boards. Alameda requires a 3.3V supply
voltage from the Pmod
connector and uses the SPI pin assignments as
illustrated on the right.
The power requirements are shown in Table 1. Note that the external +24V
power supply is required for full system operation. The currently supported
platforms and ports are shown in Table 2.
Table 1. Power Requirements for the Alameda Subsystem Reference Design
Power Name Input Voltage (V) Input Current (mA, typ)
3.3V Pmod Power Supply 3.3 6
+24V 18 to 32 140
Table 2. Supported Platforms and Ports
Supported Platforms Communication Ports Physical Support Ports
LX9 platform (Spartan -6) J4 J5 (no electrical connection)
ZedBoard platform (Zynq -7020)* JB1 JA1 (no electrical connection)
*Tested with ZedBoard Rev C.
The MAX15500 (U1–U4) is a single-channel, low-cost, precision analog current/voltage output conditioner
developed to meet the requirements of PLCs and other industrial control and automation applications. The
MAX15500 operates from a ±15V to ±32.5V power-supply range.
The MAX15500 can generate both unipolar and bipolar current and voltage outputs. In current mode, the
device produces currents of -1.2mA to +24mA or -24mA to +24mA. In voltage mode, the device produces
voltages of -0.3V to +6V, -0.6V to +12V, or ±12V. To allow for overrange and underrange capability in
unipolar mode, the transfer
function of the MAX15500 is offset so that when the voltage at AIN is 5% of full
scale, IOUT is 0mA and VOUT is 0V. Once VAIN attains full scale, VOUT or IOUT becomes full scale +5% or
+20% depending on the state of FSMODE.
The MAX15500 protects against overcurrent and short-circuit conditions when OUT goes to ground or a
voltage up to ±32.5V. The device also monitors for overtemperature and supply brownout conditions. The
supply brownout threshold is programmable between ±10V and ±24V in 2V increments. The MAX15500
provides extensive error reporting of short-circuit, open-circuit, brownout, and overtemperature conditions
through the SPI interface and an additional open-drain
interrupt output (ERROR). The MAX15500 also
includes an analog 0 to 3V output (MON) to monitor the load condition at OUT.
The MAX5134 (U5) is a quad 16-bit, buffered voltage-output, high-linearity DAC. The device features 4-
channel, very low deadband (0.02V max) rail-to-rail outputs. For most applications, no negative biasing
power supply is required.
The MAX6126 (U6) drives the analog output conditioners and the DAC's reference inputs with an ultra-high-
precision 4.096V voltage reference with 0.02% initial accuracy and a 3ppm/°C maximum temperature
coefficient (tempco).
The DAC's outputs directly drive the conditioners' inputs with no external components, making the interface
simple.
The MAX17498B (U8) provides an isolated, functional insulation class power solution that accepts single
+18V to +32V DC voltage and converts it to ±24V and +8V using an isolation transformer in flyback
architecture. Post-regulation is accomplished using the MAX1659 LDO (U9) for the 5V output.
Data isolation between the subsystem and the controller is accomplished using the MAX14850 (U7) digital
data isolator. The combined power and data isolation achieved is 600V .
Detailed Description of Firmware for LX9 and ZedBoard
Platforms
Table 2 shows the currently supported platforms and ports. Support for additional platforms may be added
periodically under Firmware Files in the All Design Files section.
The Alameda firmware released for the LX9 development kit
targets a Microblaze soft-core microcontroller
placed inside a Xilinx Spartan-6 FPGA. The Alameda firmware also supports the ZedBoard kit and targets
an ARM Cortex -A9 processor placed inside a Xilinx Zynq system-on-chip (SoC
).
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