STLC5411FN datasheet(34/72 Pages) STMICROELECTRONICS

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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

continously. 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

TEST1

TEST2

FUNCTIONS

Normal operation

Send Single Pulse

± 1

Random Data Transmitted

Send Single Pulse

± 3

TURNING ON AND OFF THE DEVICE

STLC5411 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

MONITOR channel depending of CID bit in CR2

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

the

initial

application

power,

STLC5411 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 activation request

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

ACT

STLC5411

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