RAA730300_15 Datasheet, PDF (67/120 Pages) Renesas Technology Corp – Monolithic Programmable Analog IC

RAA730300
5.3 Registers Controlling the Low-Pass Filter
The low-pass filter is controlled by the following 3 registers:
• MPX setting register 3 (MPX3)
• Power control register 2 (PC2)
• Input mode control register (IMS)
5. Low-Pass Filter
(1) MPX setting register 3 (MPX3)
This register is used to control MPX7, MPX8, MPX9, and MPX10.
When selecting the signal to be input to the filter circuits, use bits 5 and 4.
When switching the order in which signals are processed by the low-pass and high-pass filters, use bit 3.
When switching the output signal from MPX7, use bits 1 and 0.
Reset signal input clears this register to 00H.
Address: 05H After reset: 00H R/W
7
6
MPX3
0
0
5
SCF2
4
SCF1
3
SCF0
2
SW53
1
MPX71
0
MPX70
SCF2
0
0
1
1
SCF1
0
1
0
1
Source of input to filter circuits
SC_IN pin
MPX7 output signal
General-purpose operational amplifier Ch2 output signal
Setting prohibited
SCF0
0
1
Specification of the order of filter signal processing
The MPX9 output signal passes the low-pass filter and then is input to the high-pass filter.
The MPX9 output signal passes the high-pass filter and then is input to the low-pass filter.
MPX71
MPX70
Specification of MPX7 output signal
0
0
Open pin
0
1
Configurable amplifier Ch1 output signal
1
0
Configurable amplifier Ch2 output signal
1
Remark
1
Configurable amplifier Ch3 output signal
Bits 7 and 6 can be set to 1, but this has no effect on the function.
R02DS0011EJ0110 Rev.1.10
May. 31, 2014
Page 67 of 117