參數(shù)資料
型號(hào)： SI3211-KT
廠商： Silicon Laboratories Inc
文件頁數(shù)： 80/148頁
文件大?。?/td> 0K
描述： IC SLIC/CODEC PROG 1CH 38TSSOP
標(biāo)準(zhǔn)包裝： 50
系列： ProSLIC®
功能： 用戶線路接口概念（SLIC），CODEC
接口： PCM，SPI
電路數(shù)： 1
電源電壓： 3.3V，5V
電流 - 電源： 88mA
功率（瓦特）： 700mW
工作溫度： 0°C ~ 70°C
安裝類型： 表面貼裝
封裝/外殼： 38-TFSOP（0.173"，4.40mm 寬）
供應(yīng)商設(shè)備封裝： 38-TSSOP
包裝： 管件
包括： BORSCHT 功能，DTMF 生成和解碼，F(xiàn)SK 來電形顯示接收生成，脈沖測(cè)量生成，振鈴和電池電壓
Si3210/Si3211
Rev. 1.61
37
Not
Recommended
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boost dc-dc converter that converts a positive dc
voltage into the desired negative battery voltage. In
addition to eliminating external power supplies, this
allows the Si3210 to dynamically control the battery
voltage to the minimum required for any given mode of
operation.
Two different dc-dc circuit options are offered: a BJT/
inductor version and a MOSFET/transformer version.
Due to the differences on the driving circuits, there are
two different versions of the Si3210. The Si3210
supports the BJT/inductor circuit option, and the
Si3210M version supports the MOSFET solution. The
only difference between the two versions is the polarity
of the DCFF pin with respect to the DCDRV pin. For the
Si3210, DCDRV and DCFF are of opposite polarity. For
the Si3210M, DCDRV and DCFF are the same polarity.
Table 27 summarizes these differences.
Extensive design guidance on each of these circuits can
be obtained from “AN45: Design Guide for the Si3210
DC-DC Converter” and from an interactive dc-dc
converter design spreadsheet. Both of these documents
are available on the Silicon Laboratories website
(www.silabs.com).
2.2.2. BJT/Inductor Circuit Option Using Si3210
The BJT/Inductor circuit option shown in Figure 10 on
page 18 offers a flexible, low-cost solution. Depending
on selected L1 inductance value and the switching
frequency, the input voltage (VDC) can range from 5 V to
30 V. Because of the 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 VDC power supply.
For this solution, a PNP power BJT (Q7) switches the
current flow through low ESR inductor L1. The Si3210
uses the DCDRV and DCFF pins to switch Q7 on and
off. DCDRV controls Q7 through NPN BJT Q8. DCFF is
ac-coupled to Q7 through capacitor C10 to assist R16 in
turning off Q7. Therefore, DCFF must have opposite
polarity to DCDRV, and the Si3210 (not Si3210M) must
be used.
Table 27. Si3210 and Si3210M Differences
Device
DCFF Signal
Polarity
DCPOL
Si3210
= DCDRV
0
Si3210M
= DCDRV
1
Notes:
1. DCFF signal polarity with respect to DCDRV signal.
2. Direct Register 93, bit 5; This is a read-only bit.
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