SI3232-BQ Silicon Laboratories Inc, SI3232-BQ Datasheet - Page 50

• Manufacturer Part Number: SI3232-BQ
• Description: IC SLIC PROG DUAL-CH 64TQFP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI3232-BQ

• Package / Case: *
• Function: Subscriber Line Interface Concept (SLIC)
• Interface: ISDN
• Number Of Circuits: 2
• Voltage - Supply: 3.13 V ~ 3.47 V
• Current - Supply: 28mA
• Power (watts): 280mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Product: SLIC
• Supply Voltage (min): 3.13 V
• Supply Current: 28 mA
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Number Of Channels: 2
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Si3232
of RAM data to the RAMDATLO, RAMDATHI. Finally,
write the RAM address to the RAMADDR register.
Chip Select
For register or RAM space access, there are three ways
to use chip select: byte length, 16-bit length, and access
duration length. The byte length method releases chip
select after every 8 bits of communication with the
Si3232. The time between chip select assertions must
be at least 220 ns.
The 16-bit length chip select method is similar to the
byte
communicated with the Si3232. This means that Si3232
communication consists of a control byte, address byte
for one 16-bit access, and two data bytes for a second
16-bit access. In a single data byte communication
(control byte, address byte, data byte), the data byte
should be loaded into either the high byte or both bytes
of the second 16-bit access for a write. The 8-bit data
exists in the high and low byte of a 16-bit access for a
read. The time between chip select assertion must be at
least 220 ns.
Access duration length allows chip select to be pulled
low for the length of a number of Si3232 accesses.
50
length
method
except
CPU
Figure 27. SPI Daisy Chain Control Architecture
SDO
SPI Clock
SDI
CS
that
16-bits
Preliminary Rev. 0.95
are
There are two very specific rules for this type of
communication. One rule is that the SCLK must be of a
frequency that is less than 1/2x220 ns (<2.25 MHz).
The second rule is that access must be done in a 16-bit
modulus. This 16-bit modulus follows the same rules as
described above for 16-bit length access where 8-bit
data is concerned.
Protected Register Bits
The Si3232 has protected register bits that are meant to
retain the integrity of the Si3232 circuit in the event of
unintentional software register access. To access the
user-protected bits, write the following sequence of data
bytes to register address 87 (0x57):
0x02
0x10
0x12
0x00
Following the modification of any protected bit, the
same sequence should be immediately written to place
these bits into their protected state.
Protected bits exist in registers SBIAS and THERM.
SCLK
SCLK
SCLK
CS
SDO
CS
SDO
CS
SDO
Channel 14
Channel 15
Channel 0
Channel 1
Channel 2
Channel 3
SDITHRU
SDITHRU
SDITHRU
SDI
SDI
SDI
SDI0
SDI1
SDI2
SDI3
SDI4
SDI14
SDI15
Si3232 #1
Si3232 #8
Si3232 #2