- 您现在的位置：买卖IC网 > PDF目录1850 > MAX8939EWV+T (Maxim Integrated Products)IC PWR MGMT HANDSETS 30WLP PDF资料下载
参数资料
| 型号： | MAX8939EWV+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 26/45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： | * |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页当前第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页第43页第44页第45页
MAX8939/MAX8939A/MAX8939B
System Power Management
for Mobile Handset
sition on SDA with SCL high. A STOP condition is a low-to-
high transition on SDA, while SCL is high (Figure 12).
A START condition from the master signals the begin-
ning of a transmission to the ICs. The master terminates
transmission by issuing a not acknowledge followed by a
STOP condition (see the Acknowledge section for more
information). The STOP condition frees the bus. To issue
a series of commands to the slave, the master may issue
REPEATED START (Sr) commands instead of a STOP
command to maintain control of the bus. In general, a
REPEATED START command is functionally equivalent
to a regular start command.
When a STOP condition or incorrect address is detected,
the ICs internally disconnect SCL from the serial inter-
face until the next START condition, minimizing digital
noise and feedthrough.
Acknowledge
Both the master and the ICs (slave) generate acknowl-
edge bits when receiving data. The acknowledge bit is
the last bit of each 9-bit data packet. To generate an
acknowledge (A), the receiving device must pull SDA
low before the rising edge of the acknowledge-related
clock pulse (ninth pulse) and keep it low during the high
period of the clock pulse (Figure 13). To generate a not
acknowledge (NA), the receiving device allows SDA to
be pulled high before the rising edge of the acknowl-
edge-related clock pulse and leaves it high during the
high period of the clock pulse.
Monitoring the acknowledge bits allows for detection
of unsuccessful data transfers. An unsuccessful data
SDA OUTPUT
FROM
TRANSMITTER
SDA OUTPUT
FROM
RECEIVER
D7
D6
D0
NOT ACKNOWLEDGE
transfer occurs if a receiving device is busy or if a system
fault has occurred. In the event of an unsuccessful data
transfer, the bus master should reattempt communica-
tion at a later time.
Slave Address
SCL FROM
MASTER
1
2
8
9
ACKNOWLEDGE
A bus master initiates communication with a slave device
(ICs) by issuing a START condition followed by the slave
address. The slave address byte consists of 7 address bits
START CONDITION
CLOCK PULSE FOR
ACKNOWLEDGEMENT
(0110001) and a read/write bit (R/ W ). After receiving the
proper address, the ICs issue an acknowledge by pulling
SDA low during the ninth clock cycle.
Figure 13. I 2 C Acknowledge
LEGEND
MASTER TO SLAVE
SLAVE TO MASTER
A. WRITING TO A SINGLE REGISTER WITH THE "WRITE BYTE" PROTOCOL
1
S
7
SLAVE ADDRESS
1
0
1
A
8
REGISTER POINTER
1
A
8
DATA
1
A
1
P
NUMBER OF BITS
R/W
B. WRITING TO MULTIPLE REGISTERS
1
S
7
SLAVE ADDRESS
1
0
1
A
8
REGISTER POINTER X
1
A
8
DATA X
1
A
8
DATA X+1
1
A
NUMBER OF BITS
R/W
8
DATA X+n-1
1
A
8
DATA X+n
1
A
P
NUMBER OF BITS
Figure 14. Writing to the MAX8939/MAX8939A/MAX8939B
SMBus is a trademark of Intel Corp.
26
Maxim Integrated
相关PDF资料 |
PDF描述 |
|---|---|
| MAX893LESA+T | IC SW P-CH HS 8-SOIC |
| MAX8940EXK28+T | IC REG LDO 2.8V .12A SC70-5 |
| MAX894LESA | IC SW MOSFET DUAL P-CH W/SD8SOIC |
| MAX8952BEWE+T | IC REG BUCK SYNC ADJ 2.5A 16WLP |
| MAX8969EWL35+T | IC REG BOOST SYNC 3.5V 1A 9WLP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8939QEWV+T | 制造商:Maxim Integrated Products 功能描述:SYSTEM POWER - Tape and Reel |
| 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 |
发布紧急采购，3分钟左右您将得到回复。