参数资料
型号: SC900841JVKR2
厂商: Freescale Semiconductor
文件页数: 51/192页
文件大小: 0K
描述: IC POWER MGT 338-MAPBGA
标准包装: 2,000
应用: PC,PDA
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 338-TFBGA
供应商设备封装: 338-MAPBGA
包装: 带卷 (TR)
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FUNCTIONAL DEVICE OPERATION
SYSTEM CONTROL INTERFACE
pins from the CPU, and if the DVPxVRD bit is set to a '1', the
regulator uses the VNNLATCH and VCCLATCH registers to
set the output voltage.
When the DVPxVRD bit is set to a '0', any changes to the
VNNLATCH and VCCLATCH registers should be ignored.
When the DVPxVRD bit is set to a '1', any changes on the
VID/VIDEN pins from the CPU should be ignored.
As soon as the DVPxVRD bit is set to a '1', the regulator
switches from using the VID/VIDEN pins to using the
VCCLATCH register, and the output voltage of the regulator
changes to what the VCCLATCH register is set.
Figure 16 also shows how the PMIC controls the
VRCOMP signal. The PMIC toggles the VRCOMP signal any
time the DVPxVRD bit is set to a '1' and the output voltage of
the VNN or the VCC regulator changes. If the output voltage
of the VCC/VNN regulator changes and the DVPxVRD bit is
set to a '0', the VRCOMP signal should not toggle. In other
words, VRCOMP only toggles for changes to VCC and VNN
through the SPI registers.
SCU
SCU
SCU
SCU
SCU
Figure 16. Relationship Between the VID/VIDEN Pins, the DPV1VRD Bit, and VRCOMP Signal
I2S/PCM INTERFACE
A detailed description of the I2S interface is provided in
FREESCALE CHIP SET COMMUNICATION
SIGNALS
This includes the control and status reporting signal
between the 900841 and the companion chip, 900842, in
Freescale’s power management solution.
Table 16. Freescale Chipset Communication Signals Pin
Functionality
As explained in General Description , Freescale’s power
management solution consists of two chips. The 900842
supplies the 3.3 V rail (V33).
The 900841 interfaces with the 900842 using the signals
outlined above for control and status reporting functions.
The Platform controller hub has full control over the V33
chip, by setting the desired voltage regulator control setting in
the 900841 register space. The 900841 in turn uses the
V33EN pin to enable or disable the V33 chip. This transaction
is seamless to the Platform controller hub.
If the 900841 is going through a forced shutdown event,
like THERMTRIPB assertion, it can also use the V33EN pin
Pin Name
V33EN
V33STTS
V33ISNS
V3GPAEN
V3GPASTTS
I/O
O
I
I
O
I
Pin Functionality
V33 Enable output pin
V33 Status input pin. Active low when V33
output is on
Input Interface with the ADC to measure V33
output current
Reserved
Reserved
to turn off the V33 rail. In turn, the V33 rail communicates
back to the 900841 its output voltage status, through the
V33STTS pin, so the 900841 has full visibility on the health of
the 3.3 V rail and can report back to the Platform controller
hub through the VRFAULT Interrupt if V33 has shutdown,
due to a local problem, such as over-temperature.
V33 also sends its output current information to the
900841 for sampling by the ADC through the V33ISNS pin.
900841
Analog Integrated Circuit Device Data
Freescale Semiconductor
51
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