TEA5777HN/N2 STEricsson, TEA5777HN/N2 Datasheet - Page 20

• Manufacturer Part Number: TEA5777HN/N2
• Manufacturer: STEricsson

Specifications of TEA5777HN/N2

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Philips Semiconductors
TEA5777_1
Product data sheet
9.4.2 Read mode
9.4.3 Dbus function in 3-wire mode (silent readout)
At the falling edge of signal WRITE_READ the bus interface is set to the read mode. Data
is clocked out on every falling edge of the input clock. In the read mode, pin DATA
becomes an open-collector output and an external pull-up resistor is required.
Bus pins CLOCK and DATA are bidirectional and act as inputs when bit DBUS = 0, but are
open-collector outputs when bit DBUS = 1. External pull-up resistors are required in this
case.
In Dbus mode, pins CLOCK and DATA are used for output data and pin WRITE_READ is
used as an input.
With a rising edge (write mode) or falling edge (read mode) of signal WRITE_READ the
Dbus mode is deactivated and a transmission is started.
The Dbus mode is activated with bit DBUS = 1 and after transfer of all 6 data bytes in the
write mode or all 3 data bytes in the read mode.
Data on pins CLOCK and DATA in the Dbus mode is given in
Table 8.
[1]
Bit
DBUS
0
1
1
Fig 6. 3-wire bus read data
WRITE_READ
H = HIGH-level output voltage
L = LOW-level output voltage
CLOCK
SEARCH IFCE
X
0
1
DATA
CLOCK and DATA lines in Dbus-mode
X
0
1
X
t
w(R)
Rev. 01 — 11 April 2006
Pin CLOCK
Signal
input
IFC flag
IFC flag
SFOUND
flag
Low-power AM/FM stereo radio for handheld applications
50 %
t
su(clk)
Status
-
H = IF in-window mono/stereo flag H = stereo, L = mono
H = IF in-window IFCRDY flag
H = station found BLIM flag
50 %
[1]
t
h(Q)
t
clk(L)
50 %
Pin DATA
Signal
input
© Koninklijke Philips Electronics N.V. 2006. All rights reserved.
t
Table
clk(H)
8.
t
Status
-
H = IF counter ready
H = band limit
reached
50 %
d(Q)
TEA5777
50 %
[1]
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