ST7538Q STMicroelectronics, ST7538Q Datasheet - Page 38

• Manufacturer Part Number: ST7538Q
• Description: IC TXRX FSK POWER LINE 44-TQFP
• Manufacturer: STMicroelectronics
• Type: Transceiverr

Specifications of ST7538Q

• Number Of Drivers/receivers: 1/1
• Voltage - Supply: 4.75 V ~ 5.25 V
• Mounting Type: Surface Mount
• Package / Case: 44-TQFP Exposed Pad, 44-eTQFP, 44-HTQFP, 44-VQFP
• For Use With: 497-5484 - BOARD EVAL ST7538 PWR LINE TXRX
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Protocol: -
• Other names: 497-5525

Auxiliary analog and digital functions
6.5
6.6
6.7
6.8
6.9
6.10
38/44
Output clock
MCLK is the master clock output. The clock frequency sourced can be programed through
the control register to be a ratio of the crystal oscillator frequency (Fosc, Fosc/2 Fosc/4) or
can be disabled (off). The transition between one frequency and another is done only at the
end of the ongoing cycle.
Output voltage level freeze
The Output Level Freeze function, when enabled, turns off the Voltage Control Loop once
the ALC stays in a stable condition for about 3 periods of control loop, and maintains a
constant gain until the end of transmission. Output Level Freeze can be enabled using
Control Register bit 17
Register (Control Register bit 21 = ”1”).
Extended control register
When Extended Control Register function is enabled, all the 48 bits of Control Register are
programmable. Otherwise, only the first 24 bits of Control Register are programmable. The
functions Header Recognition, Frame Bit Count and Output Voltage Freeze are available
only if Extended Control Register function is enabled. Extended Control Register can be
enabled setting the Control Register bit
Reg OK
REGOK allows to detect an incomplete writing of the Control Register content (see
Section 5.6: Control register access on page
Register content. In these cases REGOK goes to “1” until a new Control Register writing
session is performed.
Under voltage lock out
The UVLO function turns off the device if the PAVcc voltage falls under 4V. Hysteresis is
340mV typically.
Thermal shutdown
The ST7538Q is provided of a thermal protection which turn off the PLI when the junction
temperature exceeds 170°C ± 10% . Hysteresis is around 30°C.
When shutdown threshold is overcome, PLI interface is switched OFF.
Thermal Shutdown event is notified to the HOST controller using TIMEOUT line. When
TIMEOUT line is High, ST7538Q junction temperature exceed the shutdown threshold (Not
Leached).
(Table
11). This function is available only using the Extended Control
21(Table
21) or an accidental corruption of the Control
11).
ST7538Q