SI3201-KS Silicon Laboratories Inc, SI3201-KS Datasheet - Page 37

• Manufacturer Part Number: SI3201-KS
• Description: IC LINEFEED INTRFC SI321X 16SOIC
• Manufacturer: Silicon Laboratories Inc
• Series: ProSLIC®r

Specifications of SI3201-KS

• Package / Case: 16-SOIC (3.9mm Width) Exposed Pad, 16-eSOIC, 16-HSOIC
• Function: CODEC
• Interface: PCM, Serial, SPI
• Number Of Circuits: 1
• Voltage - Supply: 3.13 V ~ 5.25 V
• Current - Supply: 88mA
• Power (watts): 800mW
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Includes: BORSCHT Functions, Ring Trip Detection
• Product: SLIC
• Supply Voltage (min): 3.13 V
• Supply Current: 88 mA
• Maximum Operating Temperature: + 70 C
• Minimum Operating Temperature: 0 C
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

2.2.3. MOSFET/Transformer Circuit Option Using
The MOSFET/transformer circuit option (shown in
Figure 11 on page 21) offers higher power efficiencies
across a larger input voltage range. Depending on the
transformer’s primary inductor value and the switching
frequency, the input voltage (V
to 35 V. Therefore, it is possible to power the entire
ProSLIC solution from a single 3.3 V or 5 V power
supply. By nature of a dc-dc converter’s operation, peak
and average input currents can become large with small
input voltages. Consider this when selecting the
appropriate input voltage and power rating for the V
power supply (number of REN supported).
For this solution, an N-channel power MOSFET (M1)
switches the current flow through a power transformer,
T1. T1 is specified in “AN45: Design Guide for the
Si3210 DC-DC Converter” and includes several taps on
the primary side to facilitate a wide range of input
voltages. The Si3210M version of the Si3210 must be
used for the application circuit depicted in Figure 11
because the DCFF pin is used to drive M1 directly and,
therefore, must be the same polarity as DCDRV.
DCDRV is not used in this circuit option; connecting
DCFF and DCDRV together is not recommended.
2.2.4. DC-DC Converter Architecture
The control logic for a pulse-width-modulated (PWM)
dc-dc converter is incorporated in the Si3210. Output
pins DCDRV and DCFF are used to switch a bipolar
transistor or MOSFET. The polarity of DCFF is opposite
that of DCDRV.
The dc-dc converter circuit is powered on when the
DCOF
Register 14, bit 4) is cleared to 0. The switching
regulator
performance, pulse-width modulation controller. The
control pins are driven by the PWM controller logic in
the Si3210. The regulated output voltage (V
sensed by the SVBAT pin and is used to detect whether
the output voltage is above or below an internal
reference for the desired battery voltage. The dc
monitor pins, SDCH and SDCL, monitor input current
and voltage to the dc-dc converter external circuitry. If
an overload condition is detected, the PWM controller
will turn off the switching transistor for the remainder of
a PWM period to prevent damage to external
components. It is important that the proper value of R18
be selected to ensure safe operation. Guidance is given
in AN45.
the Si3210M
(Si3210/Si3210M Only)
bit
circuit
in
the
within
Powerdown
the
DC
) can range from 3.3 V
Si3210
Register
is
a
BAT
(direct
high-
) is
Rev. 1.45
DC
The PWM controller operates at a frequency set by the
dc-dc Converter PWM register (direct Register 92).
During a PWM period, the outputs of the control pins,
DCDRV and DCFF, are asserted for a time given by the
read-only
Register 94).
The dc-dc converter must be off for some time in each
cycle to allow the inductor or transformer to transfer its
stored energy to the output capacitor, C9. This minimum
off time can be set through the dc-dc Converter
Switching Delay register, (direct Register 93). The
number of 16.384 MHz clock cycles that the controller is
off is equal to DCTOF (bits 0 through 4) plus 4. If the dc
Monitor pins detect an overload condition, the dc-dc
converter interrupts its conversion cycles regardless of
the register settings to prevent component damage.
These inputs should be calibrated by writing the DCCAL
bit (bit 7) of the dc-dc Converter Switching Delay
register, direct Register 93, after the dc-dc converter
has been turned on.
Because the Si3210 dynamically regulates its own
battery supply voltage using the dc-dc converter
controller, the battery voltage, V
negative-most terminal by a programmable voltage,
V
signals.
As mentioned previously, the Si3210 dynamically
adjusts V
illustrate this, the behavior of V
shown in Figure 19. In the active state, the TIP-to-RING
open circuit voltage is kept at V
voltage region while the regulator output voltage
V
When the loop current attempts to exceed I
line driver circuit enters constant current mode allowing
the TIP to RING voltage to track R
terminal is kept at a constant voltage, it is the RING
terminal voltage that tracks R
|V
|V
below the VOC/I
can continue to track R
tracking mechanism is stopped when |V
(TRACK = 0). The former case is the more common
application
dissipation savings. In principle, the regulator output
voltage can go as low as |V
significant power savings.
When TRACK = 0, |V
V
to decrease with decreasing R
OV
BAT
BATL
BAT
BAT
, to allow voltage headroom for carrying audio
= V
| voltage will also track R
| = I
. The RING terminal voltage, however, continues
CM
BAT
LIM x
+ V
PWM
to suit the particular circuit requirement. To
and
R
OC
LOOP
LIM
+ V
provides
mark, the regulator output voltage
Pulse
+ V
OV
LOOP
BAT
Si3210/Si3211
CM
.
| will not decrease below
+V
(TRACK = 1), or the R
BAT
LOOP
Width
LOOP
OV
the
BAT
| = V
BAT
. As R
LOOP
.
and, as a result, the
in the active state is
OC
, is offset from the
maximum
CM
LOOP
register
in the constant
. In this state,
LOOP
+ V
BAT
. As the TIP
OV
LIM
decreases
| = |V
, offering
, the dc
(direct
power
LOOP
BATL
37
|