ADSP-TS201S
Rev. C
|
Page 19 of 48
|
December 2006
Table 13. Impedance Control Selection
CONTROLIMP1-0
Driver Mode
00 (recommended)
Normal
01
Reserved
10 (default)
A/D Mode
11
Reserved
Table 14. Drive Strength/Output Impedance Selection
DS2–0
Pins
Drive
Strength
1
Output
Impedance
2
000
Strength 0 (11.1%)
26
Ω
001
Strength 1 (23.8%)
32
Ω
010
Strength 2 (36.5%)
40
Ω
011
Strength 3 (49.2%)
50
Ω
100
Strength 4 (61.9%)
62
Ω
101 (default)
Strength 5 (74.6%)
70
Ω
110
Strength 6 (87.3%)
96
Ω
111
Strength 7 (100%)
120
Ω
1
CONTROLIMP1 = 0, A/D mode disabled.
2
CONTROLIMP1 = 1, A/D mode enabled.
Table 15. Pin Definitions—Power, Ground, and Reference
Signal
Type
Term
Description
V
DD
P
na
V
DD
pins for internal logic.
V
DD_A
P
na
V
DD
pins for analog circuits. Pay critical attention to bypassing this supply.
V
DD_IO
P
na
V
DD
pins for I/O buffers.
V
DD_DRAM
P
na
V
DD
pins for internal DRAM.
V
REF
I
na
Reference voltage defines the trip point for all input buffers, except SCLK, RST_IN,
POR_IN, IRQ3–0, FLAG3–0, DMAR3–0, ID2–0, CONTROLIMP1–0, LxDATO3–0P/N,
LxCLKOUTP/N, LxDATI3–0P/N, LxCLKINP/N, TCK, TDI, TMS, and TRST. V
REF
can be
connected to a power supply or set by a voltage divider circuit as shown in
Figure 6
.
For more information, see Filtering Reference Voltage and Clocks on Page 10.
SCLK_V
REF
I
na
System Clock Reference. Connect this pin to a reference voltage as shown in
Figure 7
.
For more information, see Filtering Reference Voltage and Clocks on Page 10.
V
SS
G
na
Ground pins.
NC
—
nc
No Connect. Do not connect these pins to anything (not to any supply, signal, or each
other). These pins are reserved and must be left unconnected.
I
= input;
A
= asynchronous;
O
= output;
OD
= open-drain output;
T
= three-state;
P
= power supply;
G
= ground;
pd
= internal pull-down
5 k
Ω
;
pu
= internal pull-up 5 k
Ω
;
pd_0
= internal pull-down 5 k
Ω
on DSP ID = 0;
pu_0
= internal pull-up 5 k
Ω
on DSP ID = 0;
pu_od_0
= internal
pull-up 500
Ω
on DSP ID = 0;
pd_m
= internal pull-down 5 k
Ω
on DSP bus master;
pu_m
= internal pull-up 5 k
Ω
on DSP bus master;
pu_ad
= internal pull-up 40 k
Ω
. For more pull-down and pull-up information, see
Electrical Characteristics on Page 22
.
Term (termination of unused pins) column symbols:
epd = external pull-down approximately 5 k
Ω
to V
SS
; epu = external pull-up approx-
imately 5 k
Ω
to V
DD_IO
, nc = not connected; na = not applicable (always used); V
DD_IO
= connect directly to V
DD_IO
; V
SS
= connect directly to V
SS
