Evaluating the LTP8800
Supported Evaluation Boards
Overview
The evaluation board allows the LTP8800 to be powered up to default settings and produces power based on configuration resistors without the need for any serial bus communication. The board by default is set to output voltages of 0.8V for LTP8800-1A and LTP8800-4A, 0.75V for LTP8800-2. Each output is rated at 150A/ 200A/135A for LTP8800-1A/4A/2, respectively.
Full performance details are provided in the LTP8800 data sheet, which should be consulted in conjunction with user guide.
Hardware Specifications
Power Supply Requirements
For this specific project an external power supply with outputs 3.3V, 7V and 54V must be used to power up the demo board.
Pin Description
Pin
Name
Description
1
SMBALERT
PMBus SMBALERT Signal
2
ISHARE
Analog Current Sharing Input/Output
3
CTRL
Hardware ON/OFF control
4
ADD
Address select
5
VS+
Non-inverting voltage sense input
6
VS-
Inverting voltage sense input
7
SYNC
Synchronization input signal
8
3V3
Internal module power supply (7V)
9
GND
Connect to Ground
10
7V0
Internal module power supply (7V)
11
VOUT
Output Voltage
12
VOUT
Output Voltage
13
VOUT
Output Voltage
14
GND
Ground
15
GND
Ground
16
VOUT
Output Voltage
17
VOUT
Output Voltage
18
VOUT
Output Voltage
19
GND
Ground
20
SCL
Serial Clock
21
SDA
Serial Data
22
VIN
Input Power Supply (45V to 65V)
Hardware Bringup
For reference, follow the Quick Start Procedure section of the corresponding demo board. user guide.
No-OS Build Setup
Please see: https://wiki.analog.com/resources/no-os/build
No-OS Supported Examples
The initialization data used in the examples is taken out from: Project Common Data Path
The macros used in Common Data are defined in platform specific files found in: Project Platform Configuration Path
Basic example
This is a simple example that initializes the LTP8800, and performs telemetry readings of the voltage, current and temperature of each output channel. Status bytes/words are also monitored in the example.
In order to build the basic example make sure you have the following configuration in the Makefile Makefile
# Select the example you want to enable by choosing y for enabling and n for disabling
BASIC_EXAMPLE = y
IIO_EXAMPLE = n
IIO example
This project is actually a IIOD demo for DC3190A-A evaluation board. The project launches a IIOD server on the board so that the user may connect to it via an IIO client.
If you are not familiar with ADI IIO Application, please take a look at: IIO No-OS
If you are not familiar with ADI IIO-Oscilloscope Client, please take a look at: IIO Oscilloscope
The No-OS IIO Application together with the No-OS IIO LTP8800 driver take care of all the back-end logic needed to setup the IIO server.
This example initializes the IIO device and calls the IIO app as shown in: IIO Example
In order to build the IIO project make sure you have the following configuration in the Makefile
# Select the example you want to enable by choosing y for enabling and n for disabling
BASIC_EXAMPLE = n
IIO__EXAMPLE = y
No-OS Supported Platforms
Maxim Platform
Used hardware
Connections:
DC3190A-A Pin Number |
Mnemonic |
Function |
MAX32666FTHR Pin Number |
1 |
SMBALERT |
Do Not Connect |
Do Not Connect |
2 |
ISHARE |
Do Not Connect |
Do Not Connect |
3 |
CTRL |
Hardware ON/OFF control |
P0_5/IO3 |
7 |
SYNC |
Do Not Connect |
Do Not Connect |
8 |
3V3 |
Power Supply (3V3) |
3V3 (optional, use external) |
9 |
GND |
Ground |
GND |
10 |
BIAS |
Connect to External Power Supply (7V0) |
Do Not Connect |
11 |
VOUT |
May connect to oscilloscope/load |
Do Not Connect |
20 |
SCL |
I2C Serial Clock |
I2C0_SCL |
21 |
SDA |
I2C Serial Data |
I2C0_SDA |
22 |
VIN |
Connect to External Power Supply (54V) |
Do Not Connect |
Build Command
# to delete current build
make reset
# to build the project
make PLATFORM=maxim TARGET=max32665
# to flash the code
make run