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| 型号： | KIT33702DWBEVB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 26/39页 |
| 文件大小： | 0K |
| 描述： | KIT FEATURES THE MC34701 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，LDO 步降 |
| 输出及类型： | 2，非隔离 |
| 输入电压： | 2.8 ~ 6V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 300kHz |
| 板类型： | 完全填充 |
| 已供物品： | 板，软件 |
| 已用 IC / 零件： | MC34702 |
| 相关产品： | MC34702EKR2CT-ND - IC POWER SUPPLY MCU 3A 32-SOIC MC34702EKR2TR-ND - IC POWER SUPPLY MCU 3A 32-SOIC MC34702EK-ND - IC POWER SUPPLY MCU 3A 32-SOIC |
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FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
1. LDO falls faster than VOUT . The VOUT uses control
methods (4) and (5) described in the section Methods
In the case VIN1 = VIN2, the intrinsic operation turns
on both the buck high side MOSFET and the LDO
external Pass MOSFET, and discharges the VOUT
load capacitor into the VIN supply.
2. VOUT falls faster than LDO. The LDO uses control
methods (5) and (6) described in the section Methods
Shorted Load
1. LDO shorted to ground. The VOUT uses methods (1)
2. VOUT shorted to ground. The LDO uses control
methods (5) and (6) described in the section Methods
3. VIN1 shorted to ground. Device is not working.
4. VIN2 shorted to ground. This is equivalent to the
switcher V OUT output shorted to ground.
5. LDO shorted to supply. No load protection. 34702 is
protected by current limit and thermal shutdown.
6. VOUT shorted to supply. No load protection. 34702 is
protected by current limit and thermal shutdown.
LOGIC COMMANDS AND REGISTERS
I 2 C BUS OPERATION
The 34702 device is compatible with the I 2 C interface
standard. SDA and SCL pins are the Serial Data and Serial
Clock pins of the I 2 C bus.
I 2 C COMMAND AND DATA FORMATS
assure its unique address. Figure 21 illustrates the flexible
addressing feature for a 7-bit address. Table 6 provides the
definition of the selectable portion of the device address.
When the ADDR pin is used and put to low level, pull the
ADDR pin to ground through a 10k ? resistor.
Communication Start
Communication starts with a START condition, followed by
the slave device unique address. The Read/Write (R/W) bit
MSB
6
1
5
1
4
1
Bits
3
0
LSB
2 1 0
1 A1 A0
defines whether the data should be read from or written to the
device (the 34702 operates only as a slave device; therefore,
the R/W bit should always be set to 0). The 34702 responds
by sending the Acknowledge bit (Ack) to the master device.
Figure 20 illustrates the beginning of an I 2 C communication
for a 7-bit slave address.
Fixed Address Selectable
Address
Figure 21. Address Bit Definition for 7-Bit Address
Table 6. Definition of Selectable Portion of Device
Address
CLKSEL Pin
ADDR Pin
A1
A0
S
7-Bit Address
R/W
Ack
Low
Low
0
0
Figure 20. Communication Start Using 7-Bit Address
Slave Address Definition
34702 has the two least significant address bits (LSB)
Low
High (Open)
High (Open)
High (Open)
Low
High (Open)
0
1
1
1
0
1
defined by the state of the CLKSEL pin (A1) and the ADDR
pin (A0).
Note The state of the CLKSEL pin also defines the
configuration of the oscillator synchronization CLKSYN pin.
Leaving the CLKSEL pin open or pulling it high defines the
CLKSYN pin as an oscillator output. When the CLKSEL pin
is pulled low, the CLKSYN pin is configured as a
synchronization input for the external clock signal.
This feature allows up to four 34702 ICs to communicate
in the same I 2 C bus, all of them sharing the same high-order
address bits. A different combination of the two LSB address
bits A1 and A0 can be assigned to each individual part to
Writing Data Into the Slave Device
After the address acknowledgment by the slave, DATA
can be written into the slave registers. The R/W bit must be
set to 0 to allow DATA to be written into the 34702. Figure 22
shows the data write sequence. Actions performed by the
slave device are grayed. ?
S 7-Bit Address 0 Ack DATA Ack
(Write)
Figure 22. Data Transfer for Write Operations
34702
Analog Integrated Circuit Device Data ?
26
Freescale Semiconductor
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