Texas Instruments ADS7881, Руководство пользователя, Страница: 5 / 23

chip-select (CS) line of the converter to be assigned to different memory locations. Instead, ground or wire the
CS line to an appropriate signal of the user processor.
Table 1-5. Jumper Settings
Reference
Designator
Description
Pins
1–2 2–3
W1 Short U8 pin 14 to power-down or reset signal Installed
(1)
—
Short U8 pin 13 to power-down or reset signal — Installed
W2 Short U8 pin 12 to CONVST signal Installed
(1)
—
Short U8 pin 11 to CONVST signal — Installed
W3 Short U8 pin 10 to RD signal Installed
(1)
—
Short U8 pin 8 to RD signal — Installed
W4 Short inverted BUSY to INTC Installed
(1)
—
Short BUSY to INTC — Installed
W5 Short +5VD to +BVDD Installed
(1)
—
Short +3.3VD to +BVDD — Installed
(1) Factory-set condition.
The data bus is available at connector P3. Table 1-6 lists the pin out information. This EVM supports two devices
but the connector signals names are based on the ADS7981, which is the higher-resolution device. Depending
on which device is being evaluated, care must be taken when connecting the EVM to a host processor.
Table 1-6. Data Bus Connector P3
Connector.Pin
(1)
Signal Name Description
ADS7881 ADS7891
P3.1 B_DB0 Not connected Buffered data bit 0 (LSB)
P3.3 B_DB1 Not connected Buffered data bit 1
P3.5 B_DB2 Buffered data bit 0 (LSB) Buffered data bit 2
P3.7 B_DB3 Buffered data Bit 1 Buffered data bit 3
P3.9 B_DB4 Buffered data bit 2 Buffered data bit 4
P3.11 B_DB5 Buffered data bit 3 Buffered data bit 5
P3.13 B_DB6 Buffered data bit 4 Buffered data bit 6
P3.15 B_DB7 Buffered data bit 5 Buffered data bit 7
P3.17 B_DB8 Buffered data bit 6 Buffered data bit 8
P3.19 B_DB9 Buffered data bit 7 Buffered data bit 9
P3.21 B_DB10 Buffered data bit 8 Buffered data bit 10
P3.23 B_DB11 Buffered data bit 9 Buffered data bit 11
P3.25 B_DB12 Buffered data bit 10 Buffered data bit 12
P3.27 B_DB13 Buffered data bit 11 (MSB) Buffered data bit 13 (MSB)
P3.29 Not connected Not connected Not connected
P3.31 Not connected Not connected Not connected
(1) All even-numbered pins of P3 are tied to DGND.
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SLAU150A – DECEMBER 2004 – REVISED OCTOBER 2021
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ADS7881EVM, ADS7891EVM Evaluation Module 5
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