KCC Quizzes AQQ303 about the radius of a circle
1. Quote of the month: "When I die, I want to die like my grandfather who died peacefully in his sleep. Not screaming like all the passengers in his car" - Will Rogers
2. Quiz AQQ304 about finding the radius of a circle
Good luck, and try to be
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August Monthly Blog Quiz! Read the blog, take the quiz, and you could win a gift card
Important: Read the blog first . The quiz questions are all based on the content of the blog:
Stay in the loop and win! Read the blog Current Output Driving Industrial Loops , then take our quick five-question quiz for a chance to win a gift card
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AD5669R
Production
The AD5669R device is a low power, octal, 16-bit, buffered voltage-output DACs. It operates from a single 2.7 V to 5.5 V supply and is guaranteed monotonic...
Datasheet
AD5669R on Analog.com
AD5629R
Production
The AD5629R device is a low power, octal, 12-bit, buffered voltage-output DACs. It operates from a single 2.7 V to 5.5 V supply and is guaranteed monotonic...
Datasheet
AD5629R on Analog.com
DAC: EVAL- AD5669R / AD5629R
MC: PIC32MK1024MCM100
API: No-OS (Dan Nechita, 2012, Implementation of AD5669R Driver)
Slaves: Only the AD DAC
Communication works somewhat if the address is 0x54 or 0x56... 0x57 simply doesn't work.
A1 = 0; A0 = 0; I get ack=1, error, no return value
A1 = 1; A0 = 0; I get ack=1, error, no return value
A1 = 1; A0 = 1; I get no ack, no return value
Hi @chris.dickerson
Could you please elaborate on the device working 'somewhat'?
Just to paraphrase the datasheet, the A0 and A1 address bits are determined by the state of the A0 pin. It is given in Table 7. Connecting A0 to VCC implies the address becomes 0x54, no connection to the pin implies address becomes 0x56 and connecting the pin to GND sets the address to 0x57.
Regards
Suraj
Part of what I meant by "somewhat" is that I was sometimes getting an ACK (as stated above) and on the scope we could see changes when watching the SDA and SCL lines.
In this example, registerValue is always 0 (zero).
if (AD5669R_Init(1, 1))
{
printf("AD5669R OK");
}
else
{
printf("AD5669R Error");
}
// power on the device
AD5669R_PowerMode(AD5669R_PWRDN_NONE);
// reads back the previously written register and displays it
unsigned short registerData = AD5669R_GetRegisterValue();
We can see the data being sent, but the API read (AD5669R_GetRegisterValue) never returns the content of the last written register.
This is a write and read:
Solved. Issue with reading was with the microcontroller. PIC's Harmony API for I2C uses a state machine and their read returns before it's done. If you put a check in for IC2_IsBusy and wait until it's not -- then you can access the data.