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Linduino
1.3.0
Linear Technology Arduino-Compatible Demonstration Board
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LTC2662: 5-Channel 16-/12-Bit 300mA SoftSpan Current Source DACs. More...
LTC2662: 5-Channel 16-/12-Bit 300mA SoftSpan Current Source DACs.
The LTC2662 is a family of 5-channel, 16-/12-bit current source digital-to-analog converters with precision integrated reference and accurate full-scale current. The LTC2662 is guaranteed monotonic and offers independent SoftSpan programmability of the current output range from 3.125mA to 300mA. The LTC2662 provides a separate VDD0-4 supply for each OUT0-4 channel. The flexible VDD0-4 supply allows operation from 2.85V to 33V. Internal 12 ohm switches allow any OUT0-4 pin to be connected to an optional negative V- supply voltage and sink up to 80mA. The SPI/Microwire-compatible 3-wire serial interface operates on logic levels as low as 1.71V, at clock rates up to 50MHz. SPI DATA FORMAT (MSB First): 24-Bit Load Sequence: Byte #1 Byte #2 Byte #3 Command MSB LSB LTC2662-16 : C3 C2 C1 C0 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 LTC2662-12 : C3 C2 C1 C0 A3 A2 A1 A0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X 32-Bit Load Sequence: Byte #1 Byte #2 Byte #3 Byte #4 Command MSB LSB LTC2662-16 : X X X X X X X X C3 C2 C1 C0 A3 A2 A1 A0 D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 LTC2662-12 : X X X X X X X X C3 C2 C1 C0 A3 A2 A1 A0 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0 X X X X Cx : DAC Command Code Ax : DAC Address (0 to F, corresponding to DAC 0 to DAC 15) Dx : DAC Data Bits X : Don't care
http://www.linear.com/product/LTC2662
http://www.linear.com/product/LTC2662#demoboards
Copyright 2018(c) Analog Devices, Inc.
All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, INTELLECTUAL PROPERTY RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
Header for LTC2662: 5-Channel 16-/12-Bit 300mA SoftSpan Current Source DACs
Definition in file LTC2662.h.
Go to the source code of this file.
Functions | |
int8_t | LTC2662_write (uint8_t cs, uint8_t dac_command, uint8_t dac_address, uint16_t dac_code) |
Write the 16-bit dac_code to the LTC2662. More... | |
uint16_t | LTC2662_current_to_code (float dac_current, float max_output) |
Calculate a LTC2662 DAC code given the desired output current. More... | |
float | LTC2662_code_to_current (uint16_t dac_code, float max_output) |
Calculate the LTC2662 DAC output current given the DAC code and max output. More... | |
Macros | |
#define | LTC2662_CS QUIKEVAL_CS |
Define the SPI CS pin. More... | |
LTC2662 Command Codes | |
OR'd together with the DAC address to form the command byte | |
#define | LTC2662_CMD_WRITE_N 0x00 |
Write to input register n. More... | |
#define | LTC2662_CMD_UPDATE_N 0x10 |
Update (power up) DAC register n. More... | |
#define | LTC2662_CMD_WRITE_N_UPDATE_ALL 0x20 |
Write to input register n, update (power-up) all. More... | |
#define | LTC2662_CMD_WRITE_N_UPDATE_N 0x30 |
Write to input register n, update (power-up) More... | |
#define | LTC2662_CMD_POWER_DOWN_N 0x40 |
Power down n. More... | |
#define | LTC2662_CMD_POWER_DOWN_ALL 0x50 |
Power down chip (all DAC's, MUX and reference) More... | |
#define | LTC2662_CMD_SPAN 0x60 |
Write span to dac n. More... | |
#define | LTC2662_CMD_CONFIG 0x70 |
Configure reference / toggle. More... | |
#define | LTC2662_CMD_WRITE_ALL 0x80 |
Write to all input registers. More... | |
#define | LTC2662_CMD_UPDATE_ALL 0x90 |
Update all DACs. More... | |
#define | LTC2662_CMD_WRITE_ALL_UPDATE_ALL 0xA0 |
Write to all input reg, update all DACs. More... | |
#define | LTC2662_CMD_MUX 0xB0 |
Select MUX channel (controlled by 5 LSbs in data word) More... | |
#define | LTC2662_CMD_TOGGLE_SEL 0xC0 |
Select which DACs can be toggled (via toggle pin or global toggle bit) More... | |
#define | LTC2662_CMD_GLOBAL_TOGGLE 0xD0 |
Software toggle control via global toggle bit. More... | |
#define | LTC2662_CMD_SPAN_ALL 0xE0 |
Set span for all DACs. More... | |
#define | LTC2662_CMD_NO_OPERATION 0xF0 |
No operation. More... | |
LTC2662 Span Codes | |
Descriptions are valid for a 1.25V reference and 20k R_FSADJ. | |
#define | LTC2662_SPAN_HI_Z 0x0000 |
#define | LTC2662_SPAN_3_125MA 0x0001 |
#define | LTC2662_SPAN_6_25MA 0x0002 |
#define | LTC2662_SPAN_12_5MA 0x0003 |
#define | LTC2662_SPAN_25MA 0x0004 |
#define | LTC2662_SPAN_50MA 0x0005 |
#define | LTC2662_SPAN_100MA 0x0006 |
#define | LTC2662_SPAN_200MA 0x0007 |
#define | LTC2662_SPAN_SW_TO_NEG_V 0x0008 |
#define | LTC2662_SPAN_300MA 0x0009 |
LTC2662 Configuration options | |
Used in conjunction with LTC2662_CMD_CONFIG command | |
#define | LTC2662_REF_DISABLE 0x0001 |
#define | LTC2662_THERMAL_SHUTDOWN 0x0002 |
#define | LTC2662_POWERLIMIT_PROTECTION 0x0003 |
#define | LTC2662_OPEN_CIRCUIT_DETECT_DISABLE 0x0004 |
LTC2662 Global Toggle | |
Used in conjunction with LTC2662_CMD_GLOBAL_TOGGLE command, affects DACs whose Toggle Select bits have been set to 1 | |
#define | LTC2662_TOGGLE_REG_A 0x0000 |
#define | LTC2662_TOGGLE_REG_B 0x0010 |
Variables | |
LTC2662 Minimums and Maximums for each Span | |
Lookup tables for minimum and maximum outputs for a given span | |
const float | LTC2662_MIN_OUTPUT [10] = {0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0} |
const float | LTC2662_MAX_OUTPUT [10] = {0.0, 3.125, 6.25, 12.5, 25.0, 50.0, 100.0, 200.0, 0, 300.0} |
float LTC2662_code_to_current | ( | uint16_t | dac_code, |
float | max_output | ||
) |
Calculate the LTC2662 DAC output current given the DAC code and max output.
dac_code | DAC code value |
max_output | Full scale current |
Definition at line 102 of file LTC2662.cpp.
uint16_t LTC2662_current_to_code | ( | float | dac_current, |
float | max_output | ||
) |
Calculate a LTC2662 DAC code given the desired output current.
dac_current | Desired current |
max_output | Full scale current |
Definition at line 88 of file LTC2662.cpp.
int8_t LTC2662_write | ( | uint8_t | cs, |
uint8_t | dac_command, | ||
uint8_t | dac_address, | ||
uint16_t | dac_code | ||
) |
Write the 16-bit dac_code to the LTC2662.
cs | Chip select |
dac_command | DAC command word |
dac_address | DAC channel address |
dac_code | 2 byte dac code |
Definition at line 70 of file LTC2662.cpp.
#define LTC2662_CMD_CONFIG 0x70 |
#define LTC2662_CMD_GLOBAL_TOGGLE 0xD0 |
#define LTC2662_CMD_MUX 0xB0 |
#define LTC2662_CMD_POWER_DOWN_ALL 0x50 |
#define LTC2662_CMD_TOGGLE_SEL 0xC0 |
#define LTC2662_CMD_UPDATE_N 0x10 |
#define LTC2662_CMD_WRITE_ALL 0x80 |
#define LTC2662_CMD_WRITE_ALL_UPDATE_ALL 0xA0 |
#define LTC2662_CMD_WRITE_N 0x00 |
#define LTC2662_CMD_WRITE_N_UPDATE_ALL 0x20 |
#define LTC2662_CMD_WRITE_N_UPDATE_N 0x30 |
#define LTC2662_CS QUIKEVAL_CS |
const float LTC2662_MAX_OUTPUT[10] = {0.0, 3.125, 6.25, 12.5, 25.0, 50.0, 100.0, 200.0, 0, 300.0} |