參數(shù)資料
型號(hào)： MAX781
廠商： Maxim Integrated Products, Inc.
英文描述： PDA/Hand-Held Computer Power Controller
中文描述： PDA手持計(jì)算機(jī)電源控制器
文件頁(yè)數(shù)： 10/24頁(yè)
文件大?。?/td> 185K
代理商： MAX781
M
PDA/Hand-Held Computer Power Controller
10
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_______________Detailed Desc ription
Modes of Operation
Table 1 describes the MAX781’s four modes of opera-
tion, and Table 2 shows how to select the desired
mode. MODE1 and MODE0 are the two bits, out of a
total of 32 bits of configuration data, which select the
operational mode. See Table 3 for a complete list of
the 32 bits of configuration data.
With –—H—D—Npulled up to the battery voltage, the
MAX781 powers on in low-power mode. After power-
up, pulling CE high temporaily places the MAX781 into
operate mode and allows data to be shifted into the
internal shift register. As soon as CE goes low, the
MAX781 enters the mode programmed by the MODE1
and MODE0 bits.
S erial Interfac e
The MAX781 is controlled by 32 bits of configuration
data. These 32 bits must be written, MSB first, into the
MAX781 using a synchronous serial interface. Table 3
describes the function of each bit of configuration data.
To turn the gate drivers on/off, select VPP voltages or
program the analog multiplexer. CE, SCLK, DIN, and
DOUT are the synchronous serial-interface pins. Figure
3 shows an example of the signal timing necessary to
send 32 bits of data to the MAX781. The first six bits
clocked out of DOUT are the status bits, and the
remaining 26 bits clocked out of DOUT should be
ignored. Figure 4 shows the detailed timing require-
ments of the synchronous serial interface.
To write the last eight bits of the configuration data
without affecting the rest of the configuration bits, clock
eight bits instead of 32 into DIN. This allows the
CHARGE, IDLE, MODE1, MODE0, and VPP control bits
to be updated in only eight serial clock cycles. As the
eight bits are clocked into DIN, the status bits are
clocked out of DOUT. Figure 5 shows an example of
such a quick access. If eight zeros are sent in a quick
access, no configuration data is updated. This allows
the status bits to be read quickly without affecting the
last byte of configuration data.
S tatus Bits
As the 32 bits of serial-configuration data are written
into the MAX781, 32 bits of data are read out of DOUT.
The first six bits contain status information, and the
remaining 26 bits should be ignored.
BATTINT and BATTSTAT (Table 3) indicate battery sta-
tus. It is assumed that the battery pack used with the
MAX781 has a thermistor attached to its negative termi-
MODE1
MODE0
0
1
x
1
x
1
–—H—D—N
1
1
0
0
1
1
1
1
0
1
0
0
CE
x
1
1
0
x
x
Resulting Mode
Shutdown
Operate
Low Power (default
on power-up)
Standby
Low Power
Operate
Standby
1
1
1
0
Table 1. MAX781 Modes of Operation
Table 2. Operating Modes
Buck switching regulator on
3OUT regulated to +3.3V
VPP outputs enabled
VHI regulated to +14V
Analog multiplexer enabled
High-side gate drivers enabled
Battery-charging current source enabled
Operate
Default on power-up
3OUT supplies 10mA at +3.3V linear
regulated from BATT
VPP outputs off (VPPA = VPPB = High-Z)
Analog multiplexer off (AOUT = High-Z)
High-side gate drivers off
(GD1 = GD2 = GD3 = GD4 = GD5 = 0V)
Battery-charging current source off
(DCHG = 5OUT)
3OUT supplies 10mA at +3.3V linear
regulated from BATT
VPP outputs off (VPPA = VPPB = High-Z)
Analog multiplexer enabled
High-side gate drivers off
Battery-charging current source enabled
Standby
Low
Power
Entire chip shut down
All blocks turned off
I
Q
< 10μA
3OUT, 5OUT, REF off
Shutdown
MODE
DESCRIPTION
相關(guān)PDF資料
PDF描述
MAX781CBX PDA/Hand-Held Computer Power Controller
MAX781EBX PDA/Hand-Held Computer Power Controller
MAX783 Triple-Output Power-Supply Controller for Notebook Computers(3.3V/5V,具有雙組PCMCIA標(biāo)準(zhǔn)VPP輸出的筆記本電腦電源控制器)
MAX786 Dual-Output Power-Supply Controller for Notebook Computers(具有25μA關(guān)斷的,3.3V/5V筆記本型電腦電源)
MAX787 5V/3.3V/3V 5A Step-Down, PWM, Switch-Mode DC-DC Regulators(5A,5V步降,PWM,開(kāi)關(guān)型DC-DC變換器)
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX781CBX 制造商:Maxim Integrated Products 功能描述:
MAX7828BQ 制造商:Maxim Integrated Products 功能描述:NON BOOK, REQUIRES NCNR, Q# - Rail/Tube
MAX7828UQ/883B 制造商:Maxim Integrated Products 功能描述:NON BOOK, REQUIRES NCNR, Q# - Rail/Tube
MAX782C/D 功能描述:DC/DC 開(kāi)關(guān)控制器 Triple-Output Power-Supply Controller for Notebook Computers RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX782C/D+ 功能描述:DC/DC 開(kāi)關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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