stlc5412 STMicroelectronics, stlc5412 Datasheet - Page 35

• Manufacturer Part Number: stlc5412
• Description: 2b1q U Interface Device Enhanced With Dect Mode
• Manufacturer: STMicroelectronics

TEST FUNCTIONS
Various test functions are provided for transmitted
pulse waveform checking, power spectral density
measurement and transmitter linearity.
Three commands in TXACT register are provided.
The associated test function is enabled as long as
the command is not disabled by any other com-
mand.
SP1: (0010) Send Single Pulses+1, -1:
+1, -1, pulses are transmitted consecutively onto
the line, one pulse per frame.
SP3: (1011) Send Single Pulses+3, -3:
+3, -3, pulses are transmitted consecutively onto
the line, one pulse per frame.
RDT: (0011) Random Data Transmitted:
Random data can be transmitted onto the line
continuously. B1, B2 and D channel transparency
between the digital interface and the line is en-
abled.
When auto-mode is selected, two test inputs
(TEST1, TEST2) are provided allowing the same
test functions as described above but without the
need of a microcontroller. See Table 6 for Test
pins biasing.
Table 6: Test Pins
TURNING ON AND OFF THE DEVICE
STLC5412 contains an automatic sequencer for
the complete control of the start-up activation se-
quences. Interactions with an external control unit
requires only Activate Request and Deactivate
Request commands, with the option of inserting
break-points in the sequence for additional exter-
nal control allowing for instance easy building of a
repetor application. Automatic control of act,
uoa/sai and dea bits in the M4 bit positions is pro-
vided, along with the specified 40 ms, 480 ms and
15 s timers used during the sequencing.
Except the Power up and Power down control
that is slightly different, the Activation/Deactiva-
tion procedures are identical in GCI and Mi-
crowire/DSI modes. Same command codes or in-
dication codes are used. In Microwire and GCI
mode, activation control is done by writing in the
Activation Control Register TXACT and by read-
ing the Activation Indication Register RXACT. For
TXACT and RXACT access, MICROWIRE port is
used in MICROWIRE mode and C/I channel (or
TEST1
1
1
0
0
TEST2
1
0
1
0
Normal operation
Send Single Pulse
Random Data Transmitted
Send Single Pulse
FUNCTIONS
1
3
MONITOR channel depending of CID bit in CR2
register) is used in GCI mode.
In MICROWIRE mode, a primitive indication gen-
erates first an interrupt requesting an action from
the Microprocessor, in GCI mode the primitive In-
dication is directly transmitted via C/I (or MONI-
TOR channel).
Power on initialization
Following
STLC5412 enters the power down deactivated
state in MICROWIRE mode or in GCI mode de-
pending on the polarization of the MW input.
All the internal circuits including the master oscil-
lator are inactive and in a low power state except
for the 10 kHz Tone signal detector. The line out-
puts LO+/LO- are low impedance and all digital
outputs are high impedance. All programmable
registers and the activation controller are reset to
their default value.
GCI configuration is defined by means of the con-
figuration pins M0, CONF1 and CONF2 when
Power supply is turned on.
For LT and NT1-2 equipments, GCI configuration
should be completed by means of Control Regis-
ter Programming. See Table 1 for configuration
pins bias.
Line signal detection
When UID is in the power down state and a
10kHz tone TN or TL is detected from the line
LSD and INT (MICROWIRE/DSI only) open drain
outputs are forced to zero.
In NT configuration , code LSD (0000) is loaded
in the activation indication register RXACT.
In LT configuration, code AP (1000) is loaded in
the activation indication register RXACT.
In Microwire/DSI these indications are sent onto
CO at the following access even if the UID is still
in power down mode.
In GCI these indications are sent onto the C/I
channel as soon as GCI clocks are available.
LSD open drain output is set back in the high im-
pedance state as soon as the UID is powered up.
INT open drain output is set back in the high im-
pedance state when CS input is detected at zero.
Depending of the ACTAUT and PUPAUT bits in
CR6 register, UID can powered up itself, also
automatically to start the activation.
For all auto mode configurations, on 10KHz tone
reception, power up and activation procedure are
full automatic, but in NT1 auto, UID waits the uoa
bit from the line before to provide (or not) the
cloks and primitives to the S device.
Power up control
Microwire/DSI: control instruction PUP in
the
initial application of
STLC5412
power,
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ACT