ADuCM350 V1.4 silicon will release in March 2016. The change from V1.2 to V1.4 is a minor metal edit to improve the robustness of the high frequency, internal RC oscillator (HFOSC). Both MAN_ID and CHIP_ID information will be updated as part of this change.
In Rev.A of the ADuCM350 datasheet, there is an error in Figure 31 and Figure 32. For both figures, the Z value is incorrect. It should read:
Z = 140Ω + 68nF
Also, the Y-axis label should read:
Number of Measurements
The same corrections apply to both Figure 31 and Figure 32. It should also be noted that the capacitors used for these measurements (including the accuracy measurements in Figures 29 and 30) were COG capacitors with 1% tolerance. This tolerance may cause a slight deviation from the ideal value.
Full I2C errata document available here.
In an attempt to minimize the power consumption of the I2C interface, it may be desirable to set the PCLK frequency to 1MHz and set the SCL frequency to 100kHz. Using the provided formula, this would lead to the following HIGH and LOW values in the I2CDIV register:
HIGH = (REQD_HIGH_TIME / PCLK_PERIOD) – 2
HIGH = ((10us / 2) / 1us) – 2
HIGH = 3
LOW = (REQD_LOW_TIME / PCLK_PERIOD) – 1
LOW = ((10us / 2) / 1us) – 1
LOW = 4
When these values are programmed, the I2C master will not function.
Clock stretching is an I2C feature that allows a slave device to temporarily pause communication by holding SCL low (for example, a slave device receives a READ request from a Master but, its Transmit FIFO is empty).
Clock stretching is enabled setting the STRETCHSCL bit in the I2CSCON register to 1. If this is done on the rising edge of SCL a glitch can occur. Other devices might interpret this as a real clock pulse and it could cause the bus to hang.
Lack of Readme
Refer to AN-1282 Application Note in Documentation Folder.
“Right” and “Left” buttons do not work
These pads are used as external interrupts on board. Remove R63 and R65. See Eval-ADuCM350 motherboard schematic for details.
UART Comms Does not work
The simplest fix is to call “test_Init()” after “adi_initpinmux()” instead of before. Baud Rate is 9600.
M5 needs to be connected for VDD_IO supply.
LK14 needs to be inserted for VLCD_VDD supply.
Reveiew Pin-Out for GPIO supplies
This display has been discontinued by supplier. Code is just for reference only.