SRC4194 Configuration Modes
3-4
3.2
SRC4194 Configuration Modes
The SRC4194 can be set to one of two configuration modes: Hardware (or
Standalone) or Software (via a four-wire SPI port). The H/S element of switch
SW2 is used to set the mode. Table 3−2 summarizes the H/S mode switch set-
tings.
Table 3−2. Setting the Configuration Mode
H/S Switch Setting
SRC4194 Configuration Mode
LO
Software Mode
HI
Hardware (or Standalone) Mode
3.2.1
SRC4194 Hardware (or Standalone) Mode Configuration
In Hardware mode, switches SW1, SW2, SW4, and SW5 are used to set the
dedicated control pins to either a low or high logic level. The switches corre-
spond one-to-one with the pin names of the SRC4194 device. Table 3−3 sum-
marizes the switch functions and available settings for each element of switch
SW1, SW2, SW4, and SW5.
In addition to the switches already mentioned, a momentary pushbutton switch
(SW3) is used for the SRC4194 reset function. The RST input (pin 21) of the
SRC4194 is normally pulled high via an external 10k
Ω
resistor connected to
the VIO supply bus. When the pushbutton is pressed, the switch shorts the
RST pin to ground. Releasing the switch then causes the RST pin to be pulled
high again. By momentarily pressing and then releasing SW3, the user can
generate a reset pulse for the SRC4194.
Summary of Contents for SRC4194EVM
Page 1: ... July 2004 User s Guide SBAU096 ...
Page 32: ...3 12 ...
Page 38: ...PCB Layout 4 6 Figure 4 4 Bottom Side Silk Screen ...
Page 39: ...PCB Layout 4 7 Schematic PCB Layout and Bill of Materials Figure 4 5 Top Layer Component Side ...
Page 40: ...PCB Layout 4 8 Figure 4 6 Ground Plane Layer ...
Page 41: ...PCB Layout 4 9 Schematic PCB Layout and Bill of Materials Figure 4 7 Power Layer ...
Page 42: ...PCB Layout 4 10 Figure 4 8 Bottom layer Solder Side ...
