Datasheet

TLE7269G
Functional Description
Data Sheet 10 Rev. 1.2, 2007-11-13
4.2.1 Normal Slope Mode
In Normal Slope mode data transmission rates up to 20 kBauds are possible. Setting the EN pin to “High” starts
the transition to Normal Operation mode. Depending on the signal on the TxD1 pin, the TLE7269G changes either
into Normal Slope mode or Low Slope mode (see Figure 5).
The mode change to Normal Slope mode is defined by the time
t
MODE
and the time t
TXD,SET
. The time t
MODE
specifies the delay time between the threshold, where the EN pin detects a “High” input signal, and the actual
mode change of TLE7269G into Normal Slope mode. The time
t
TXD,SET
defines the setup time in which the TxD1
pin has be set to “High”. After the time
t
TXD,SET
expires, the logical “High” signal on the TxD1 pin has to be stable
to put the part into Normal Slope mode.
In the time window
t
MODE
- t
TXD,SET
the TLE7269G makes the transition to Normal Slope mode but remains in Stand-
By mode until the time
t
MODE
expires.
Finally to release the data communication it is required to set the TxD1 and the TxD2 pin to “High” for the time
t
to,rec.
Figure 5 Timing to enter Normal Slope Mode
4.2.2 Low Slope Mode
In Low Slope mode data transmission rates up to 10.4 kBauds are possible. Setting the EN pin to “High” starts the
transition to Normal Operation mode. Depending on the signal of the TxD1 pin the TLE7269G changes either into
Normal Slope mode or Low Slope mode (see Figure 6).
The mode change to Low Slope mode is defined by the time
t
MODE
and the time t
TXD,SET
. The time t
MODE
specifies
the delay time between the threshold, where the EN pin detects a “High” input signal, and the actual mode change
of TLE7269G to Low Slope mode. The time
t
TXD,SET
defines the setup time in which the TxD1 pin can be set to
“Low”. After the time
t
TXD,SET
expires, the logical “Low” signal on the TxD1 pin has to be stable to put the part into
Low Slope mode.
In the time window
t
MODE
- t
TXD,SET
the TLE7269G makes the transition into Low Slope mode but remains in Stand-
By mode until the time
t
MODE
expires.
Finally to release the data communication it is required to set the TxD1 and the TxD2 pin to “High” for the time
t
to,rec.
t
MODE
Stand-By Mode / Sleep Mode Normal Slope Mode
EN
TxD1
t
TxD,SET
V
EN,ON
Mode
Transition
t
to,rec
Data transmission