E-ST7538P STMicroelectronics, E-ST7538P Datasheet - Page 20
![IC TXRX FSK POWER LINE 44-TQFP](/photos/6/84/68458/497-44-tqfp_44-lqfp_sml.jpg)
E-ST7538P
Manufacturer Part Number
E-ST7538P
Description
IC TXRX FSK POWER LINE 44-TQFP
Manufacturer
STMicroelectronics
Type
Transceiverr
Datasheet
1.ST7538P013TR.pdf
(30 pages)
Specifications of E-ST7538P
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
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Protocol
-
Other names
497-5332
E-ST7538P
E-ST7538P
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
E-ST7538P
Manufacturer:
ST
Quantity:
9 820
Company:
Part Number:
E-ST7538P
Manufacturer:
STMicroelectronics
Quantity:
10 000
ST7538
3.8 Crystal Oscillator
ST7538 integrates a sub-threshold driver circuit to realize a 16MHz crystal oscillator.
This circuit is able to drive a maximum load capacitance of 16pF with typical quartz ESR of 40Ω.
If the internal driver circuit is used, only one external crystal quartz and two external load capacitors (C
e C
Figure 19. Typical crystal configuration if ST7538 internal crystal driver circuit is used
If an external oscillator is used, XIN must be connected to DVss, while XOUT must satisfy the specifica-
tions given in table 5 (see also fig.20).
Figure 20. XOUT waveforms if an external oscillator is used (see table 8 for parameter values)
3.9 Control Register
The ST7538 is a multi-channel and multifunction transceiver. An internal 24 Bits Control Register allows
to manage all the programmable parameters (table 11).
The programmable functions are:
■
■
■
■
■
■
20/30
Channel Frequency
Baud Rate
Deviation
Watchdog
Transmission Timeout
Frequency Detection Time
2
) are needed to realize the oscillator function (fig.19).
XIN = DV
XIN = DV
XOUT
XOUT
SWING
SWING
SS
SS
C
C
XIN
XIN
1
1
ST7538
ST7538
Quartz
Quartz
XOUT
XOUT
C
C
2
2
XOUT
XOUT
OFFSET
OFFSET
1