8 to 1 Analog Multiplexer Datasheet AMux8 V 1.1
001-13257 Rev. *J
8 to 1 Analog Multiplexer
Copyright © 2001-2015 Cypress Semiconductor Corporation. All Rights Reserved.
PSoC® Blocks
Resources
Digital
Analog CT
API Memory (Bytes)
Analog SC
Flash
RAM
Pins (per
External I/O)
CY8C29/27/24/22/23/21xxx, CY8CLED02/04/08/16, CY8CLED0xD, CY8CLED0xG, CY8CTST110, CY8CTMG110,
CY8CTST120, CY8CTMG120, CY8CTMA120, CY8C21x45, CY8C22x45, CY8CPLC20, CY8CLED16P01,
CY8C28x43, CY8C28x13, CY8C28x52, CY7C64215
0
0
0
44
0
1 to 8
Features and Overview
High impedance input
Input signals may be rail-to-rail
Can be used with RefMux to multiplex input signals to switch capacitor block
Programmable control of input source
The AMUX8 User Module provides an eight-input-analog-signal-multiplexer to a Continuous Time (CT)
block, controlled by an API. One of four input signals may be selected to the input of the amplifier in the CT
block. These input signals are connected to fixed ports, depending on which column the user module is
placed. The module is also used in conjunction with a RefMux to route the multiplexed signals to the
analog column bus.
The AMUX8 User Module is used when the application needs to dynamically select from two or more ports
during operation.
If the input pin to the CT does not need to change during program operation, use the Device Editor to
select the desired pin. This is done by left-clicking the AInMux_n mux.
Figure 1.
AMux8 Block Diagram
Cypress Semiconductor Corporation
Document Number: 001-13257 Rev. *J
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Revised March 12, 2015
8 to 1 Analog Multiplexer
Functional Description
The AMUX8 User Module gives an API to control two analog input multiplexers (AInMux_x) and the
analog columns 1 and 2. The output of the AInMux_n is routed to the PMux (Positive input Mux) of the
amplifier in the CT block. The PMux in the CT block can be configured to accept the input from the AMUX8
User Module, by selecting the “AnalogInput_ColumnMux_n" for one of the inputs.
Figure 2.
AMUX8 Connection to CT Block
DC and AC Electrical Characteristics
Unless otherwise specified in the following table, all limits guaranteed for TA = -40°C to +85°C, VDD = 5.0V
± 10%.
Table 1.
5.0V AMUX8 DC and AC Electrical Characteristics
Parameter
Input Leakage
Conditions and Notes
Gross tested to 1 µA
Minimum
Typical
Limit
Units
--
1
--
nA
Input Capacitance
0.5
1.7
8
pF
Bandwidth
--
10
--
MHz
Input Voltage Range
0
--
VDD
V
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8 to 1 Analog Multiplexer
Unless otherwise specified in the following table, all limits guaranteed for TA = –40°C to +85°C, VDD =
3.3V ± 10%.
Table 2.
3.3V AMUX8 DC and AC Electrical Characteristics
Parameter
Input Leakage
Conditions and Notes
Typical
Limit
Units
--
†
--
nA
Input Capacitance
0.5
1.7
8
pF
Bandwidth
--
10
--
MHz
Input Voltage Range
0
--
VDD
V
Note
Gross tested to 1 µA
Minimum
See the device datasheet for typical values.
Placement
The AMUX8 User Module maps into any of the four AInMux blocks, as shown in Figure 3:
Figure 3.
AMUX8 Placement
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8 to 1 Analog Multiplexer
If used in conjunction with a RefMux User Module, the eight input signals may be multiplexed onto the
analog column bus. This allows routing rail-to-rail signals into some of the switched capacitor blocks (or
user modules) such as filters and ADCs. The AMUX8 User Module does not use a CT block, but connects
to most user modules that do use CT blocks.
Figure 4.
Usage of AMux8 and RefMux Combined
Parameters and Resources
Note
Configurable parameters are not available for CY8C24X23 devices.
Analog Column Mux
This parameter selects the multiplexer. Valid inputs are 1 or 2 for analog columns 1 and 2. The column
second from the left is ‘1‘and column to its right is ‘2‘. Use the multiplexer AInMux_n mux, directly
above the CT block in the selected analog column.
AInMux
The AMUX8 User Module uses two of the four AInMux analog multiplexers resources to select one of
eight input pins.
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8 to 1 Analog Multiplexer
Application Programming Interface (API)
The Application Programming Interface (API) routines are given as part of the user module to allow the
designer to deal with the module at a higher level. This section specifies the interface to each function
together with related constants provided by the “include" files.
Note
In this, as in all user module APIs, the values of the A and X register may be altered by calling an API
function. It is the responsibility of the calling function to preserve the values of A and X before the call if
those values are required after the call. This “registers are volatile" policy was selected for efficiency
reasons and has been in force since version 1.0 of PSoC Designer. The C compiler automatically takes
care of this requirement. Assembly language programmers must ensure their code observes the policy,
too. Though some user module API function may leave A and X unchanged, there is no guarantee they
may do so in the future.
For Large Memory Model devices, it is also the caller's responsibility to preserve any value in the
CUR_PP, IDX_PP, MVR_PP, and MVW_PP registers. Even though some of these registers may not be
modified now, there is no guarantee that will remain the case in future releases.
AMUX8_InputSelect
Description:
Switches selected port to the CT block.
C Prototype:
void
AMUX8_InputSelect(BYTE bChannel);
Assembly:
mov
A, AMUX8_PORT0_3
lcall AMUX8_InputSelect
Parameters:
bChannel: One byte that specifies which port pin is connected to the CT Block. The usable ports are
all input pins to port0, 0 thru 7. Symbolic names are given in C and assembly, and their associated
values, are listed in the following table:
Symbolic Name
Value
AMUX8_PORT0_0
0x00
AMUX8_PORT0_1
0x01
AMUX8_PORT0_2
0x02
AMUX8_PORT0_3
0x03
AMUX8_PORT0_4
0x04
AMUX8_PORT0_5
0x05
AMUX8_PORT0_6
0x06
AMUX8_PORT0_7
0x07
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8 to 1 Analog Multiplexer
Note
The symbolic names are generated regardless of whether the device you are using has these
ports available or not. Do not use the symbolic names associated with pins that do not exist on
your device.
Return Value:
None
Side Effects:
The A and X registers may be altered by this function.
AMUX8_Start
Description:
At present, this function performs no action and is not required for operation of the AMUX8. It is given
for compatibility only.
C Prototype:
void
AMUX8_Start(void);
Assembly:
lcall
AMUX8_Start
Parameters:
None
Return Value:
None
Side Effects:
The A and X registers may be altered by this function.
AMUX8_Stop
Description:
Currently this function performs no action and is not required for operation of the AMUX8 User
Module. It is given for compatibility only.
C Prototype:
void
AMUX8_Stop(void);
Assembly:
lcall
AMUX8_Stop
Parameters:
None
Return Value:
None
Side Effects:
The A and X registers may be altered by this function.
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8 to 1 Analog Multiplexer
Sample Firmware Source Code
Here is a simple assembly example for selecting an analog signal using AMUX8:
;;----------------------------------------------------------------;; Sample ASM Code for the AMUX8 user module
;;
;;----------------------------------------------------------------export _main
include "m8c.inc"
include "AMUX8.inc"
_main:
mov A,AMUX8_PORT0_3
call AMUX8_InputSelect
; specify port pin Port0_3
; to connect to the CT block
; …Other code
ret
The sample project written in C is:
//----------------------------------------------------------------// Sample C Code for the AMUX8 user module
//
//----------------------------------------------------------------#include "m8c.h"
#include "AMUX8.h"
void main(void)
{
BYTE bPortNumber;
bPortNumber = AMUX8_PORT0_3;
AMUX8_InputSelect(bPortNumber);
// Assign port number
// Switch Port0, pin3 to the
// CT block.
// …Other code
}
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8 to 1 Analog Multiplexer
Configuration Registers
This register is configured by the initialization and API library. You do not have to change or read this
register directly. This section is given as a reference.
Table 3.
Register AMX_IN
Bit
7
Value
ACI3[1]
6
ACI3[0]
5
ACI2[1]
4
ACI2[0]
3
ACI1[1]
2
ACI1[0]
1
ACI0[1]
0
ACI0[0]
ACI3[1:0]: Mux control bits for AInMux_3. ACI2[1:0]: Mux control bits for AInMux_2. ACI1[1:0]: Mux control
bits for AInMux_1. ACI0[1:0]: Mux control bits for AInMux_0.
Table 4.
Register ABF_CR0
Bit
Value
7
6
ACol1Mux
ACol2Mux
5
na
4
na
3
na
2
na
1
na
0
na
Acol1Mux switches between Analog Column muxes 0 and 1. ACol2Mux switches between Analog Column
muxes 2 and 3.
Version History
Version
1.1
Note
Originator
DHA
Description
Added Version History
PSoC Designer 5.1 introduces a Version History in all user module datasheets. This section documents high level descriptions of the differences between the current and previous user module versions.
Document Number: 001-13257 Rev. *J
Revised March 12, 2015
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