Athena

Table of contents

1 Overview 2 Analog Input 3 Analog Output 4 Digital I/O 5 Athena Universal Driver Functions

Overview

Athena's Data Acquistion is compatible with that of Prometheus. They have the same register map and code written for Prometheus will work just as well on Athena and vice versa. The only different software wise is watchdog timer; Athena has a different watchdog timer register map.

Analog Input

Max Input Channels: 16 (single-ended) or 8 (differential)
A/D Resolution: 16 bits (1/65536 of full-scale)
Data range: -32768 to +32767 for all voltrage ranges
Input Ranges (Bipolar): ±10V, ±5V, ±2.5V, or ±1.25V
Input Ranges (Unipolar): 0-8.3V, 0-5V, or 0-2.5V
Supported Conversion Triggers: Software, Internal Clock, or External TTL Signal
Maximum Conversion Rate:

• Software Command: approx. 20,000 samples per second, depending on code and operating system
• Interrupt Routine w/FIFO: 100,000 samples per second

FIFO: 48 samples with programmable threshold

This board supports the following programmable input ranges and resolutions:

A/D Ranges
Code	Range	ADBU	G1	G0	Input Range	Resolution (1 LSB)
0	0	0	0	0	±10V	305μV
1	0	0	0	1	±5V	153μV
2	0	0	1	0	±2.5V	76μV
3	0	0	1	1	±1.25V	38μV
4	0	1	0	0	Invalid Setting	-
5	0	1	0	1	Invalid Setting	-
6	0	1	1	0	Invalid Setting	-
7	0	1	1	1	Invalid Setting	-
8	1	0	0	0	±10V	305μV
9	1	0	0	1	±5V	153μV
10	1	0	1	0	±2.5V	76μV
11	1	0	1	1	±1.25V	38μV
12	1	1	0	0	0 - 8.3V	153μV
13	1	1	0	1	0 - 5V	76μV
14	1	1	1	0	0 - 2.5V	38μV
15	1	1	1	1	Invalid Setting	-

NOTE: Ranges 9 through 11 are identical to ranges 0 through 2.

Analog Output

Max Output Channels: 4
D/A Resolution: 12 bits (1/4096 of full-scale)
Data range: 0 to 4095 for all voltage ranges
Bipolar Output Ranges: ±10V
Unipolar Output Ranges: 0-10V

Digital I/O

Max Ports: 3, bi-directional, programmable in 8-bit groups, TTL-compatible, similar to 82C55 Digital I/O ports on Prometheus require direction to be set with dscDIOSetConfig() before use.

All DIO lines power-up in input mode and have readback capability.
All DIO lines have 4.7K Ohm pull resistors that can be configured for all pull-up or all pull-down with a jumper.

Athena Universal Driver Functions

• dscADSample()
• dscADSampleInt()
• dscADScan()
• dscADScanInt()
• dscADSetChannel()
• dscADSetSettings()
• dscDAConvert()
• dscDAConvertScan()
• dscDAConvertScanInt()
• dscCounterDirectSet()
• dscCounterRead()
• dscCounterSetRate()
• dscCounterSetRateSingle()
• dscDIOInputBit()
• dscDIOInputByte()
• dscDIOOutputBit()
• dscDIOOutputByte()
• dscDIOSetBit()
• dscDIOSetConfig()
• dscSetUserInterruptFunction()
• dscClearUserInterruptFunction()
• dscUserInt()
• dscWatchdogDisable()
• dscWatchdogEnable()
• dscWatchdogTrigger()