參數(shù)資料
型號(hào)： DS21348GN
廠商： DALLAS SEMICONDUCTOR
元件分類： Digital Transmission Interface
英文描述： DATACOM, PCM TRANSCEIVER, BGA49
封裝： CABGA-49
文件頁(yè)數(shù)： 32/44頁(yè)
文件大?。?/td> 1078K
代理商： DS21348GN
MAX8660/MAX8660A/MAX8660B/MAX8661
High-Efficiency, Low-IQ, PMICs with Dynamic
Voltage Management for Mobile Applications
38
1
S
NUMBER OF BITS
R/W
SLAVE ADDRESS
7
0
18
REGISTER POINTER
1
18
DATA
A
1
P
1
SLAVE TO MASTER
MASTER TO SLAVE
LEGEND
1
S
R/W
SLAVE ADDRESS
7
0
18
REGISTER POINTER X
A
1
A
18
DATA X
A
1
P
1
8
REGISTER POINTER n
A
18
DATA n
A
1
8
REGISTER POINTER Z
A
18
DATA Z
A
1
A. WRITING TO A SINGLE REGISTER WITH THE “WRITE BYTE” PROTOCOL
B. WRITING TO MULTIPLE REGISTERS WITH THE “MULTIPLE-BYTE REGISTER-DATA PAIR” PROTOCOL
NUMBER OF BITS
A
Figure 11. Writing to the MAX8660/MAX8661
Design Procedure
Setting the Output Voltages
The REG1 and REG2 regulators each have three preset
voltages that are programmed with the SET1 and SET2
inputs. See the
REG1 (VCC_IO) Step-Down DC-DC
Converter (MAX8660 Only) and REG2 (VCC_IO,
VCC_MEM) Step-Down DC-DC Converters sections for
more information. V8 is fixed at 3.3V and cannot be
changed.
V3–V7 are set by the I2C interface. See the
I2C
Interface section for more information. Note that while
operating in forced-PWM mode with an input voltage
greater than 4.3V, the minimum output voltage of REG3
and REG4 is limited by the minimum duty cycle. In
forced-PWM mode, the minimum output voltage for
REG3 or REG4 is:
Note that the above minimum voltage limitation does
not apply to normal-mode operation.
Inductor Selection
Calculate the inductor value (LIDEAL) for each of REG1
through REG4 as follows:
This sets the peak-to-peak inductor current ripple to 1/4
the maximum output current. The oscillator frequency,
fOSC, is 2MHz, and the duty cycle, D, is:
Given LIDEAL, the peak-to-peak inductor ripple current
is 0.25 x IOUT(MAX). The peak inductor current is 1.125
x IOUT(MAX). Make sure that the saturation current of the
inductor exceeds the peak inductor current, and the
rated maximum DC inductor current exceeds the maxi-
mum output current (IOUT(MAX)). Inductance values
smaller than LIDEAL can be used to reduce inductor
size; however, if much smaller values are used, peak
inductor current rises and a larger output capacitance
may be required to suppress output ripple. Larger
D
V
OUT
IN
=
L
xV
x D x
D
Ix f
IDEAL
IN
OUT MAX
OSC
=
41
()
Vx V
MIN
PV
MIN
PV
3
0 167
4
0 167
3
4
=
.
相關(guān)PDF資料
PDF描述
DS21348T DATACOM, PCM TRANSCEIVER, PQFP44
DS21348TN DATACOM, PCM TRANSCEIVER, PQFP44
DS21348G DATACOM, PCM TRANSCEIVER, BGA49
DS21Q348N DATACOM, PCM TRANSCEIVER, PBGA144
DS21Q348 DATACOM, PCM TRANSCEIVER, PBGA144
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS21348GN+ 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3V E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21348GNB 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21348GN-C01 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3V E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21348T 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3V E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
DS21348T+ 功能描述:網(wǎng)絡(luò)控制器與處理器 IC 3.3V E1/T1/J1 Line Interface RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray
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