Datasheet

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Table 3. J1 – Serial Control Inputs (continued)
Pin Number Signal Description
J1.4 DGND These pins are connected to digital ground.
J1.10
J1.18
4.2.2 Parallel Control –J4
Connector J4 contains parallel control signals such as write enable and read enable. Four address lines
are also provided to allow the stacking of multiple ADS8556EVMs. The signals applied to this connector
are routed to the ADS8556 through U7 when SW1.4 is in the ON position. Table 4 describes the control
lines found on J4.
Table 4. J4 – Parallel Control
Pin Number Signal Description
J4.1 DC_CNTL G2A input to address decoder U3. Default low by pull down resistor R33
J4.3 DC_AWE Active low write enable input to ADS8556 – used with /CS to write to the configuration register
J4.5 DC_ARE Active low read enable input to ADS8556 – used with /CS to read from the parallel data bus
J4.7 DC_A0 3 Line to 8 Line Address decoder input A
J4.9 DC_A1 3 Line to 8 Line Address decoder input B
J4.11 DC_A2 3 Line to 8 Line Address decoder input C
J4.13 DC_A3 3 Line to 8 Line Address decoder input G1 – must be high to enable address line decoder
J4.15 N/C No Connection
J4.17 DC_TOUT CONVST_A/B/C inputs when shunt jumpers are placed in their default states on JP9 as described in
Table 2
J4.19 DC_INTa Interrupt source to host processor – connects directly to pin 18 (BUSY) of the ADS8556
J4.2 thru DGND These pins are connected to digital ground.
J4.20 (even)
4.2.3 Parallel Data – J5
Connector J5 contains parallel data lines. The signals applied to this connector are routed to the ADS8556
through U7 when SW1.4 is in the ON position. Table 5 describes the control lines found on J4.
Table 5. J4 – Parallel Control
Pin Number Signal Description
J5.1 thru J5.31 DC[D0..D15] 16-bit parallel data bus used when writing to or reading from the ADS8556 in parallel mode
ODD
J5.2 thru J5.32 DGND These pins are connected to digital ground.
EVEN
5 Related Documentation from Texas Instruments
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Data Sheets: Literature Number:
ADS8556 SBAS404
THS4032 SLOS224
OPA211 SBOS377
REF5025 SBOS410
9
SLAU298–November 2009 ADS855xEVM
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