參數(shù)資料
型號： DS21348GN
廠商： DALLAS SEMICONDUCTOR
元件分類： Digital Transmission Interface
英文描述： DATACOM, PCM TRANSCEIVER, BGA49
封裝： CABGA-49
文件頁數(shù)： 29/44頁
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
35
START and STOP Conditions
When the serial interface is inactive, SDA and SCL idle
high. A master device initiates communication by issuing
a START condition. A START condition is a high-to-low
transition on SDA with SCL high. A STOP condition is a
low-to-high transition on SDA, while SCL is high (Figure 8).
A START condition from the master signals the begin-
ning of a transmission to the MAX8660/MAX8661. The
master terminates transmission by issuing a not-
acknowledge followed by a STOP condition (see the
Acknowledge Bit section for more information). The
STOP condition frees the bus. To issue a series of com-
mands to the slave, the master may issue repeated
start (Sr) commands instead of a stop command in
order 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 MAX8660/MAX8661 internally disconnect SCL from
the serial interface until the next START condition, mini-
mizing digital noise and feedthrough.
Acknowledge Bit
Both the master and the MAX8660/MAX8661 (slave)
generate acknowledge 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 acknowl-
edge-related clock pulse (ninth pulse) and keep it low
during the high period of the clock pulse (Figure 9). To
generate a not acknowledge (A), the receiving device
allows SDA to be pulled high before the rising edge of
the acknowledge-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
transfer occurs if a receiving device is busy or if a sys-
tem fault has occurred. In the event of an unsuccessful
data transfer, the bus master should reattempt commu-
nication at a later time.
Slave Address
A bus master initiates communication with a slave
device (MAX8660/MAX8661) by issuing a START condi-
tion followed by the slave address. As shown in Figure
10, the slave address byte consists of 7 address bits
and a read/write bit (R/W). After receiving the proper
address, the MAX8660/MAX8661 issue an acknowledge
by pulling SDA low during the ninth clock cycle. Note
that the R/W bit is always zero since the MAX8660/
MAX8661 are write only.
The Marvell PXA3xx processor supports 0x68 (SRAD =
GND) as the I2C slave address.
SP
Sr
SCL
SDA
tHD;STA
tSU;STO
tSU;STA
Figure 8. START and STOP Conditions
tSU;DAT
tHD;DAT
S
SCL
SDA
12
8
9
NOT ACKNOWLEDGE
ACKNOWLEDGE
Figure 9. Acknowledge Bits
S
ACKNOWLEDGE
SCL
SDA
12
3
1
0
89
45
6
7
0
1
0
SRAD
0
A
SRAD
0 (GND)
1 (IN)
SLAVE ADDRESS (WRITE)
BINARY
HEXADECIMAL
0x68
0x6A
0b 0110 1000
0b 0110 1010
R/W = 0
(WRITE ONLY)
Figure 10. Slave Address Byte
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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