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参数资料
| 型号： | MAX8939EWV+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 27/45页 |
| 文件大小： | 0K |
| 描述： | IC PWR MGMT HANDSETS 30WLP |
| 标准包装： | 2,500 |
| 应用： | 充电泵，无线设备 |
| 输入电压： | 2.9 V ~ 5.5 V |
| 输出数： | 7 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
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MAX8939/MAX8939A/MAX8939B
System Power Management
for Mobile Handset
Write Operations
The ICs recognize the write byte protocol as defined in
the SMBus K specification and shown in section A of
Figure 14. The write byte protocol allows the I 2 C master
device to send 1 byte of data to the slave device. The
write byte protocol requires a register pointer address for
the subsequent write. The ICs acknowledge any register
pointer even though only a subset of those registers
actually exists in the device. The write byte protocol is
as follows:
1) The master sends a START command.
2) The master sends the 7-bit slave address followed by
a write bit (0x62).
3) The addressed slave asserts an acknowledge by pull-
ing SDA low.
4) The master sends an 8-bit register pointer.
5) The slave acknowledges the register pointer.
6) The master sends a data byte.
7) The slave updates with the new data.
8) The slave acknowledges the data byte.
9) The master sends a STOP condition.
In addition to the write-byte protocol, the ICs can write
to multiple registers as shown in section B of Figure 14.
This protocol allows the I 2 C master device to address the
slave only once and then send data to a sequential block
of registers starting at the specified register pointer.
Use the following procedure to write to a sequential
block of registers:
1) The master sends a START command.
LEGEND
MASTER TO SLAVE
SLAVE TO MASTER
2) The master sends the 7-bit slave address followed by
a write bit (0x62).
3) The addressed slave asserts an acknowledge by pulling
SDA low.
4) The master sends the 8-bit register pointer of the first
register to write.
5) The slave acknowledges the register pointer.
6) The master sends a data byte.
7) The slave updates with the new data.
8) The slave acknowledges the data byte.
9) Steps 6 to 8 are repeated for as many registers in the
block, with the register pointer automatically incre-
mented each time.
10) The master sends a STOP condition.
Read Operations
The method for reading a single register (byte) is shown
in section A of Figure 15. To read a single register:
1) The master sends a START command.
2) The master sends the 7-bit slave address followed by
a write bit (0x62).
3) The addressed slave asserts an acknowledge by pulling
SDA low.
4) The master sends an 8-bit register pointer.
5) The slave acknowledges the register pointer.
6) The master sends a repeated START condition.
7) The master sends the 7-bit slave address followed by
a read bit (0x063).
A. READING A SINGLE REGISTER
1 7
1
1
8
1
1
7
1
1
8
NUMBER
OF BITS
S
SLAVE ADDRESS
0
A
REGISTER POINTER
A Sr
SLAVE ADDRESS
1
A
DATA
NA
P
R/W
R/W
B. READING MULTIPLE REGISTERS
1 7
1
1
8
1
1
7
1
1
8
NUMBER
OF BITS
S
SLAVE ADDRESS
0
A
REGISTER POINTER X
A Sr
SLAVE ADDRESS
1
A
DATA X
A
R/W
8
8
R/W
8
NUMBER
OF BITS
DATA X+1
A
DATA X+n-1
A
DATA X+n
NA
P
Figure 15. Reading from the MAX8939/MAX8939A/MAX8939B
Maxim Integrated
27
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| MAX893LESA | 功能描述:电源开关 IC - USB 1.2A Current-Limited High-Side PCh Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX893LESA+ | 功能描述:电源开关 IC - USB 1.2A Current-Limited High-Side PCh Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX893LESA+T | 功能描述:电源开关 IC - USB 1.2A Current-Limited High-Side PCh Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX893LESA-T | 功能描述:电源开关 IC - USB 1.2A Current-Limited High-Side PCh Switch RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
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