MPR03X

Sensors

14

Freescale Semiconductor

Preliminary

5.4

Baseline Values

In addition to the second level filter data, the data from the baseline filter (or third level filter) is also displayed. In this case, the

least two significant bits are removed before the 10-bit value is displayed in the register.

5.4.1

Baseline Value Register

The Baseline Value register contains the third level filtered data on each of the electrodes. It is a truncated 10 bit A/D value

displayed in the 8 bit register. The address of the ELE0 Baseline Value register is 0x1A. The address of the ELE1 Baseline Value

register is 0x1B. The address of the ELE2 Baseline Value register is 0x1C.

Figure 20. Filtered Data High Register

7

6

543210

RBV

W

Reset:

0

0

000000

= Unimplemented

Table 9. Filtered Data High Register Field Descriptions

Field

Description

7:0

BV

Baseline Value – The Baseline Value byte displays the higher 8 bits of the 10 bit

baseline value.

00000000 Encoding 0 – The 10 bit baseline value is between 0 and 3.

~

11111111 Encoding 255 – The 10 bit baseline value is between 1020 and 1023.