DLP-IO14 Datasheet DLP-IO14 | P7-P9

Rev. 1.0 (June 2012) 7 © DLP Design, Inc.

Set

Reference

Voltage &

Save

Two-Byte

Command

Select

Reference

Voltage for

ASCII Mode

Voltage

Calculation

Command:

‘*’ (0x2A)

Followed by

‘0’ – ‘9’.

0 0 2.2V reference selected and saved.

1 1 2.5V reference selected and saved.

2 2 3.0V reference selected and saved.

3 3 3.3V reference selected and saved.

4 4 3.5V reference selected and saved.

5 5 4.0V reference selected and saved.

6 6 4.096V reference selected and saved.

7 7 4.5V reference selected and saved.

8 8 4.8V reference selected and saved.

9 9 5.0V reference selected and saved. (Default)

Reference voltage used in ASCII Mode by the DLP-IO14

for calculating voltage. (Not required in Binary Mode

since actual voltage is calculated in the host program.)

Selection is saved for power-up default. EX:

*9 sent via

HyperTerminal sets 5.0 volt reference.

Set Sample

Rate &

Save

Two-Byte

Command

Select the

A/D Sample

Rate Used

Command

0x7A

Command:

‘=’ (0x3D)

Followed by

‘0’-‘7’ or

0x30-0x37

0 0x30 200s/s selected and saved.

1 0x31 500s/s selected and saved.

2 0x32 1Ks/s selected and saved.

3 0x33 2Ks/s selected and saved.

4 0x34 4Ks/s selected and saved.

5 0x35 10Ks/s selected and saved.

6 0x36 20Ks/s selected and saved.

7 0x37 30Ks/s selected and saved.

Sets the A/D sample rate for Command 0x7A. The

selection is saved for power-up default. EX: 0x3D, 0x05

sets the conversion rate at 10K samples per second.

Set

Number of

Samples &

Save

Two-Byte

Command

Set the

Number of

Samples

Acquired by

Command

0x7A

Command:

‘[‘ (0x5B)

Followed by

‘0’-‘8’ or

0x30-0x38

0 0x30 32 return samples selected and saved.

1 0x31 64 return samples selected and saved.

2 0x32 128 return samples selected and saved.

3 0x33 256 return samples selected and saved.

4 0x34 512 return samples selected and saved.

5 0x35 1024 return samples selected and saved.

6 0x36 2048 return samples selected and saved.

7 0x37 4096 return samples selected and saved.

8 0x38 8192 return samples selected and saved.

Sets the number of A/D samples returned from

Command 0x7A. The selection is saved for power-up

default. EX: 0x5B, 0x06 sets the number of samples to

2048.

Read

Current

Setup

Read and

Return the

Current

Saved Setup

j 0x6A Returns the six saved parameters. (See Table 3 for a

description of each parameter.)

In ASCII Mode, six ASCII characters (0-9) separated by

spaces are returned followed by a CR/LF.

In Binary Mode, 6 bytes are returned.

Rev. 1.0 (June 2012) 8 © DLP Design, Inc.

Single A/D

Conversion

Read Analog

Voltage from

the Current

Channel and

Return to Host

v 0x76 Read a single voltage from the selected channel.

2 bytes are returned for each conversion.

If in ASCII Mode, voltage is calculated using current

voltage reference parameters (see Table 3) and

returned as an ASCII string followed by CR/LF.

If in Binary Mode, two bytes for the 10-bit A/D counts

are returned--LSByte first. To calculate voltage for

Channels 1-12:

int temp = byte2 * 255 + byte1;

float volts = temp / 1023 * reference voltage;

To calculate voltage for ch13 or ch14, *add* this line of

code:

volts = ( volts - (vrefvoltage/2.0) ) * 2.0;

Multiple

A/D

Conversion

Read Multiple

Analog

Voltages from

the Current

Channel and

Return to Host

z 0x7A Read multiple voltages from the selected channel per

the selected setup parameters (see Table 3).

2 Bytes are returned for each conversion.

This command is only available in Binary Mode.

Two bytes for the 10-bit A/D counts from each

measurement are returned; MSByte first.

To calculate voltage for Channels 1-12:

int temp = byte1 * 255 + byte2;

float volts = temp / 1023 * reference voltage;

To calculate voltage for ch13 and ch14, *add* this line

of code:

volts = ( volts - (vrefvoltage/2.0) ) * 2.0;

Notes

1. Requires a DS18B20+ digital temperature sensor (purchased separately). See Section 10.0 of

this document for connection details. Before issuing a Convert Sensor Command, make sure

that a digital temperature sensor is present on the selected digital I/O channel with a 1.5K-ohm

pullup resistor. (Refer to the DLP-IO14 demo code provided for temperature calculation method

in Binary Mode.) Other examples are available from www.maxim-ic.com

in Application Note

AN162.pdf.

2. Using the host 5V power supply as a reference may not produce accurate voltage measure-

ments. For better accuracy, connect and select a precision voltage reference to Channel 3. (See

Commands 0x78 and 0x2A for more details.)

TABLE 3

Selectable Power-Up Default Settings

Range Voltage

Reference

Sample

Rate

Number of Samples

Returned

°C/°F Return

Mode

Reference

Source

0 2.2V 200s/s 32 °F ASCII Internal 5V

1 2.5V 500s/s 64 °C Binary External

2 3.0V 1Ks/s 128

3 3.3V 2Ks/s 256

4 3.5V 4Ks/s 512

5 4.0V 10Ks/s 1024

6 4.096V 20Ks/s 2048

7 4.5V 30Ks/s 4096

8 4.8V 8192 Default

9 5.0V

9.0 REFERENCE JUMPER SELECTION

A three-pin jumper selection is provided for setting the reference used by the analog input buffer for

Channels 13 and 14. These channels accept voltages in the range of ±5V if the internal reference is

selected. If the external reference is selected and an external reference voltage is applied to Channel 3,

then the input voltage range can be from ±2.2V up to ±5.0V.

Pin 1 of this 3-pin jumper is closest to Wiring Terminal A1. Place a jumper across Pins 1 and 2 to select

the external reference applied to the terminal for Channel 3. Place the jumper across 2 and 3 to select

the internal 5V reference (factory default).

P1-P3 P4-P6 P7-P9 P10-P12 P13-P13

DLP-IO14

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