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參數(shù)資料
| 型號： | PC34704BEP |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類： | 電源管理 |
| 英文描述： | 8-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC56 |
| 封裝： | 7 X 7 MM, 1 MM HEIGHT, 0.40 MM PITCH, ROHS COMPLIANT, QFN-56 |
| 文件頁數(shù)： | 26/50頁 |
| 文件大?。?/td> | 2010K |
| 代理商： | PC34704BEP |
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Analog Integrated Circuit Device Data
32
Freescale Semiconductor
34704
FUNCTIONAL DEVICE OPERATION
LOGIC COMMANDS AND REGISTERS
REG8 Regulation Mode
The 34704 assigns a 1-bit register to indicate REG8’s
regulation mode (REG8MODE Register). The processor
assigns this register to either regulation mode before
enabling the REG8 output.
When REG8 is current regulated, LED backlight current
can be reduced from the maximum in 16 steps through
the I2C interface
The maximum LED current can be set using the external
resistor at the bottom of the LED string, then through I2C
programming, this current value can be reduced in 16 steps.
34704 assigns a 4-bit register for this function (ILED
register
)
The ILED setting is not a guaranteed characteristic from
IMAX* (1/16) to IMAX* (9/16), due to an error amp common
mode limitation.
USER ACCESSIBLE FLAG REGISTERS
Cold Start Flag
The 34704 assigns a 1-bit register (COLDF Register) to
flag the processor that the power up was a result of battery
insertion and not through ONOFF pin. This flag should be
cleared after power up by the processor.
Shutdown Flag
The 34704 assigns a 1-bit register (SHUTDOWN Register)
to flag the processor if a shutdown signal is received through
the ONOFF pin and a programmable time period with a
default of 1sec has elapsed.
Dynamic Voltage Scaling Status Flag
In addition and for each regulator, 34704 assigns a 1-bit
register (DVSSTATx register) to flag to the processor that the
desired output voltage level set with the (DVSSETx register)
has been reached.
USER ACCESSIBLE FAULT REGISTERS
Over-current Fault Register
The 34704 assigns a 1-bit register for each regulator
(ILIMFx Register) to indicate a fault due to over-current limit,
where x corresponds to each regulator from REG1 to REG8,
except REG7
Short-circuit Fault Register
The 34704 assigns a 1-bit register for each regulator
(SCFx Register) to indicate a fault due to short-circuit current
limit, where x corresponds to each regulator from REG1 to
REG8, except REG7
Soft Start
MSB
LSB
0.5ms
0
2ms
0
1
8ms
1
0
32ms
1
REG8 Regulation
bit
Current (Default)
0
Voltage
1
LED Current
MSB
LSB
IMAX * (1/16)
0
IMAX * (2/16)
0
1
IMAX * (3/16)
0
1
0
IMAX * (4/16)
0
1
IMAX * (5/16)
0
1
0
IMAX * (6/16)
0
1
0
1
IMAX * (7/16)
0
1
0
IMAX * (8/16)
0
1
IMAX * (9/16)
1
0
IMAX * (10/16)
1
0
1
IMAX * (11/16)
1
0
1
0
IMAX * (12/16)
1
0
1
IMAX * (13/16)
1
0
IMAX * (14/16)
1
0
1
IMAX * (15/16)
1
0
IMAX (Default)
1
Cold Start Flag
bit
/ONOFF (Default)
0
Battery Insertion
1
/ONOFF Status
bit
Normal (Default)
0
Shutdown
1
DVS STATUS
bit
DVS Not Done
0
DVS Done
1
ILIMF
bit
False
0
True
1
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