CS5503-BS View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
CS5503-BS Datasheet PDF : 54 Pages
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CDB5501 CDB5503
CDB5501/CDB5503
tored to signal when data into the output registers
is complete (DCS returns high). The DACK sig-
nal is not needed in this mode and the lockout
signal to the the S1 inputs of registers U9 and
U10 may be disabled by removing the connection
on the circuit board. A place is provided on the
board for this purpose. A pull-up resistor is pro-
vided on the S1 inputs of the registers if the
connection is opened.
SEC (Synchronous External Clocking) Mode
The SEC mode enables the CS5501/CS5503 to be
directly interfaced to microcontrollers which out-
put a clock signal to synchronously input serial
data to an input port. The CS5501/CS5503 will
output its serial data at the rate determined by the
clock from the microcontroller.
Connector P10 allows a microcontroller access to
the CS5501/CS5503 signal lines which are neces-
sary to operate in the SEC mode.
The CSB (chip select bar CS) signal allows the
microcontroller to control when the
CS5501/CS5503 is to output data. The DRB (data
Baud Rate Clock Divider (CLK/2n) with INT CLK on P1 selected.
CLK = 4.9152 MHz
P-3
Baud Rate CLK Divider
8
19.2 kHz
9
9.6 kHz
10
4.8 kHz
11
2.4 kHz
12
1.2 kHz
On-Board Baud Rate Clock Input to CS5501/CS5503 SCLK Input.
P-11
NC
BC
SCLK Input to CS5501/CS5503
No Connection
Baud Clock
Table 3. On-Board Baud Rate Generator
4488
ready bar) signal on P10 indicates to the micro-
controller when data from the CS5501/CS5503 is
available. Clock from the microcontroller is input
into SCI (serial clock input) and data output from
the CS5501/CS5503 is presented to the SD (serial
data) pin of the P10 connector. Note that the
jumpers on connectors P9 and P11 must be in the
NC (no connection) position to allow the micro-
controller full control over the signals on P10.
AC (Asynchronous Communication) Mode
(for CS5501 evaluation only)
The AC mode enables the CS5501 to output data
in a UART-compatible format. Data is output as
two characters consisting of one start bit, eight
data bits, and two stop bits each.
The output data rate can be set by a clock input to
the SCI input at connector P10 (see Figure 2).
The jumper on P11 must be in the NC position.
Alternatively an output data bit rate can be se-
lected as a sub-multiple of the external CLKIN
signal to the board or as a sub-multiple of the on-
board 4.9152 MHz oscillator. Counter IC U2
divides its input by 2n where n = 8, 9, ...12. One
of these outputs can be jumper selected at con-
nector P3 (see Figure 1). For example, if the
4.9152 MHz oscillator is selected as the input to
IC U2 then a 1200 baud rate clock can be se-
lected with the jumper at n = 12. Table 3
indicates the baud rates available at connector P3
when the 4.9152 MHz oscillator is used. If the
on-board baud clock is to be used, the jumper on
connector P11 should be in the BC (Baud Clock)
position.
Data Output Interface: RS-232 (for CS5501
evaluation only).
The RS232 port is depicted in Figure 4. Sub-D
connector P6 along with interface IC U11 pro-
vides the necessary circuitry to connect the
CS5501 to an RS-232 input of a computer. For
proper operation the AC (Asynchronous Commu-
nication) data output mode must be selected. In
DS31DB43
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