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PDF PCF7991AT Data sheet ( Hoja de datos )
| Número de pieza | PCF7991AT | |
| Descripción | Advanced Basesation IC | |
| Fabricantes | Philips | |
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INTEGRATED CIRCUITS
DATA SHEET
PCF7991AT
Advanced Basestation IC
Product Specification (Rev. 1998 Apr 20)
printed 1998 Apr 20
1 page  
Philips Semiconductors
Advanced Basestation IC
6 PINNING INFORMATION
6.1 Pinning Diagram
Product Specification (Rev. 1998 Apr 20)
PCF7991AT
Pin 1 ID
VSS 1
TX2 2
VDD 3
TX1 4
MODE 5
PCF7991AT
XTAL1 6
XTAL2 7
14 RX
13 QGND
12 CEXT
11 N.C.
10 DOUT
9 DIN
8 SCLK
Fig.2 Pinning diagram for PCF7991AT.
6.2 Pin Description
Table 1 Pin description for PCF7991AT
SYMBOL PIN
DESCRIPTION
VSS 1 Common ground, GND.
TX2 2 Antenna driver output.
VDD 3 Supply voltage input, stabilized.
TX1 4 Antenna driver output.
MODE
5 Microcontroller interface mode select.
XTAL1
6 Oscillator interface, external clock reference input.
XTAL2
7 Oscillator interface.
SCLK
8 Microcontroller interface: serial clock input.
DIN
DOUT
N.C.
9 Microcontroller interface: serial data in.
10 Microcontroller interface: serial data out.
11 Not connected.
CEXT
12 High pass filter decoupling.
QGND 13 Analog ground bias.
RX 14 Receiver input.
printed 1998 Apr 20
5
5 Page 
Philips Semiconductors
Advanced Basestation IC
Product Specification (Rev. 1998 Apr 20)
PCF7991AT
9.3 WRITE_TAG
This is the 3 bit short form of the command WRITE_TAG_N. It allows to switch into WRITE_TAG-mode with a minimum
communication time.
The behaviour of the WRITE_TAG command is identical to WRITE_TAG_N with two exceptions:
WRITE_TAG-mode is entered after assertion of the 3rd command bit.
No N parameter is specified with this command; instead the N value which has been programmed with the most recent
WRITE_TAG_N command is used. If no WRITE_TAG_N was issued so far, a default N=0 (transparent mode) will be
assumed.
WRITE_TAG-mode is terminated immediately by a low to high transition at SCLK. As a result, the driver resume their
initial state, regardless the actual state of the modulation pulse timer.
Table 5 WRITE_TAG command sequence
BIT NO.
Command
76543210
REMARK
1 1 0 − − − − − no response
9.4 READ_PHASE
This command is used to read the antenna´s phase TANT, which is measured at every carrier cycle. The phase is coded
binary in D5-D0.
Table 6 READ_PHASE command sequence
BIT NO.
Command
Response
76543210
00001000
0 0 D5 D4 D3 D2 D1 D0
REMARK
9.5 SET_SAMPLING_TIME
This command specifies the demodulator sampling time Ts. The sampling time is coded binary in D5-D0.
Table 7 SET_SAMPLING_TIME command sequence
BIT NO.
Command
76543210
REMARK
1 0 D5 D4 D3 D2 D1 D0 no response
printed 1998 Apr 20
11
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