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MMPF0200Z 数据表(PDF) 26 Page - NXP Semiconductors

部件名 MMPF0200Z
功能描述  12 Channel Configurable Power Management Integrated Circuit
PDF  118 Pages
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制造商  NXP [NXP Semiconductors]
网页  http://www.nxp.com
标志 NXP - NXP Semiconductors

MMPF0200Z 数据表(HTML) 26 Page - NXP Semiconductors

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Analog Integrated Circuit Device Data
26
Freescale Semiconductor
PF0200Z
Functional Block Requirements and Behaviors
Bias and References Block Description
6.3.2
VREFDDR Voltage Reference
VREFDDR is an internal PMOS half supply voltage follower capable of supplying up to 10 mA. The output voltage is at one half
the input voltage. Its typically used as the reference voltage for DDR memories. A filtered resistor divider is utilized to create a
low-frequency pole. This divider then utilizes a voltage follower to drive the load.
Figure 7. VREFDDR Block Diagram
6.3.2.1
VREFDDR Control Register
The VREFDDR voltage reference is controlled by a single bit in VREFDDCRTL register in Table 18.
External Components
Table 18. Register VREFDDCRTL - ADDR 0x6A
Name
Bit #
R/W
Default
Description
UNUSED
3:0
–
0x00
UNUSED
VREFDDREN
4
R/W
0x00
Enable or disables VREFDDR output voltage
0 = VREFDDR Disabled
1 = VREFDDR Enabled
UNUSED
7:5
–
0x00
UNUSED
Table 19. VREFDDR External Components(27)
Capacitor
Capacitance (
F)
VINREFDDR(28) to VHALF
0.1
VHALF to GND
0.1
VREFDDR
1.0
Notes
27.
Use X5R or X7R capacitors.
28.
VINREFDDR to GND, 1.0
F minimum capacitance is provided by buck regulator output.
VINREFDDR
VREFDDR
VINREFDDR
CHALF1
Discharge
+
_
VHALF
VREFDDR
CHALF2
100 nf
100 nf
CREFDDR
1.0 uf



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