Datasheet

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SBAS253E − MAY 2003 − REVISED JULY 2006
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3 Digital Section
3.1 Introduction
The ADS7869 can interface with a DSP or µC in four different ways. The M1 and M0 pins determine in which
mode the ADS7869 will communicate; see Table 1−1. It can be connected as a standard VECANA01
interface, as an SPI, or as two different parallel interfaces.
Table 1−1. Selection of Interface Mode
M1 M0 MODE
0 0 VECANA mode
0 1 SPI mode
1 0 Parallel 1
1 1 Parallel 2
As a function of the selected mode, some pins will have different assignment as shown in Table 1−2.
Table 1−2. Mode vs Pin Functions
Pin No.
VECANA Mode
(1)
SPI
(1)
Parallel 1 Parallel 2
80, 81 (M1, M0) 00 01 10 11
56 NC NC ADDR0 (LSB) ADDR0 (LSB)
55 NC NC ADDR1 ADDR1
54 NC NC ADDR2 ADDR2
53 S1 NC ADDR3 ADDR3
52 S0 NC ADDR4 ADDR4
51 WINCLK NC ADDR5 (MSB) ADDR5 (MSB)
75 NC NC DATA0 (LSB) DATA0 (LSB)
74 NC NC DATA1 DATA1
73 NC NC DATA2 DATA2
72 NC NC DATA3 DATA3
71 NC NC DATA4 DATA4
70 ADOUT1 ADOUT1
(3)
NC DATA5 DATA5
69 ADOUT2 ADOUT2
(3)
NC DATA6 DATA6
68 ADOUT3 ADOUT3
(3)
SPISOMI DATA7 DATA7
67 ADIN ADIN
(3)
SPISIMO DATA8 DATA8
66 NC SPICLK DATA9 DATA9
65 NC NC DATA10 DATA10
64 NC NC DATA11 DATA11
63 NC NC DATA12 DATA12
62 NC NC DATA13 DATA13
61 NC NC DATA14 DATA14
60 NC NC DATA15 (MSB) DATA15 (MSB)
57 NC SPISTE CS CS
59 NC NC R/W RD / −
(2)
58 NC NC WE WR / R/W
(2)
77 CLK ADCLK
(3)
CLK CLK CLK
79 RST RST RST RST
49 NC INT INT INT
83 DAV ADBUSY
(3)
DAV DAV DAV
87 HOLD1 ADCONV
(3)
HOLD1 HOLD1 HOLD1
86 HOLD2 NPSH
(3)
HOLD2 HOLD2 HOLD2
(1) NC means no connection. The NC pins in VECANA01 and SPI modes should be grounded with a pull-down resistor.
(2) For parallel mode 11 there is one sub-mode for compatibility with the TMS320c54xx DSP family; see Mode 11 Bus Access
(TMS320c54xx DSP family-compatible mode) section.
(3) Original VECANA01 pin names.