P21/29

Rev. M, May 2010

ML5012

5-2. Starting A/D conversion

A/D conversion starts according to the bit setting of the A/D configuration register. All settings specified

by the contents of the A/D configuration register which shall set at the same time when A/D conversion

starts. Execute PGA_AC command and delivers the desired value into A/D configuration register. Please

refer to section 1-2. for the execution of PGA_AC command.

Setting to start A/D conversion

Setting of A/D configuration register

Operation

EN, S/S = 1

Start of A/D conversion

MD = 0

Set operation mode to A/D conversion

When setting A/D configuration register for A/D conversion start, the bits of A/D configuration

register other than bits shown in the table above can be any value. These bits will not affect A/D

conversion. In contrast, do not modify contents of the A/D configuration register, the AD Output

range and PGA gain value while the A/D converter is running.

5-3. Indication of end of A/D conversion

At the end of A/D conversion the bit S/S and bit EN are cleared. Monitoring one of these bits detects the

end of A/D conversion. There is an external pin (PADEOC) to indicate the end of conversion. When the

conversion is completed, an “H” pulse signal will be outputted to this pin.

5-4. Storing digitized data

The digital equivalent of analog input voltage (A/Ded data) consisting of 12 bits is stored into A/D

register : A/D[11:0].

A/Ded data stored in A/D register : A/D[11:0]

Input voltage and A/Ded data at AD_Range = 0 (ie. A/D data = 0 ~ 4,095)

Input voltage = A/D[11:0] / 4,096 *VR (V) / PGA gain

Note: A/Ded data (unsigned 12 bits) = Converts into decimal value