COP8CCR9IMT7SLASHNOPB datasheet(70/111 Pages) TI1

70 / 111 page

COP8CBR9, COP8CCR9, COP8CDR9

SNOS535I – OCTOBER 2000 – REVISED MARCH 2013

www.ti.com

Table 5-20. A/D Converter Channel Selection when the Multiplexor Output is Enabled

Mode Select

ADMOD = 0

Mux Output

Select Bits

ADMOD = 1

Single Ended

Enabled

Differential Mode

Mode

ADCH3

ADCH2

ADCH1

ADCH0

Channel No.

Channel Pairs (+,

MUX

−)

0, 1

1, 0

2, 3

3, 2

4, 5

5, 4

6, 7

7, 6

8, 9

9, 8

10, 11

11, 10

Not Used(1)

ADC13 is

Mux Output

−

See(1)

ADCH14 is

Mux Output(2)

Mux Output +

See (2)

ADCH15 is

A/D Input(2)

(1)

This Input Channel Selection should not be used in Differential Mode when the Multiplexor Output is enabled.

(2)

This Input Channel Selection should not be used when the Multiplexor Output is enabled.

5.14.1.1.2 Multiplexor Output Select

This 1-bit field allows the output of the A/D multiplexor and the input to the A/D to be connected directly to

external pins. This allows for an external, common filter/signal conditioning circuit to be applied to all

channels. The output of the external conditioning circuit can then be connected directly to the input of the

Sample and Hold input on the A/D Converter. See Figure 5-20 for the single ended mode diagram. The

Multiplexor output is connected to ADCH14 and the A/D input is connected to ADCH15. For Differential

mode, the differential multiplexor outputs are available and should be converted to a single ended voltage

for connection to the A/D Converter Input. See Figure 5-21.

The channel assignments for this mode are shown in Table 5-21.

When using the Mux Output feature, the delay though the internal multiplexor to the pin, plus the delay of

the external filter circuit, plus the internal delay to the Sample and Hold will exceed the three clock cycles

that's allowed in the conversion. This adds the requirement that, whenever the MUX bit = 1, that the

channel selected by ADCH3:0 bits be enabled, even when ADBSY = 0, and gated to the mux output pin.

The input path to the A/D converter is also enabled. This allows the input channel to be selected and

settled before starting a conversion. The sequence to perform conversions using the Mux Out feature is a

multistep process and is listed below.

1. Select the desired channel and operating modes and load them into ENAD without setting ADBSY.

2. Wait the appropriate time until the analog input has settled. This will depend on the application and the

response of the external circuit.

3. Select the same desired channel and operating modes used in step 1 and load them into ENAD and

also set ADBSY or set ADBSY by using the SBIT instruction. This will start the conversion.

Functional Description

Submit Documentation Feedback

Product Folder Links: COP8CBR9 COP8CCR9 COP8CDR9

COP8CCR9IMT7/NOPB Datasheet(PDF) 70 Page - Texas Instruments

COP8CCR9IMT7/NOPB Datasheet(HTML) 70 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL