900844 datasheet(83/118 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

900844

FUNCTIONAL DEVICE OPERATION

POWER SUPPLIES

POWER SUPPLY REGISTER MASK

Mask writes to the power supply registers, in order to avoid the need for the system controller to do read-modify-write cycles.

The mask register is shown in Table 47.

Figure 48 shows an example of the operation of the PWRMASK register.

Figure 48. PWRMASK Register Implementation Example

POWER SUPPLY PROGRAMMABLE RAMP RATE

Turn on time of all buck regulators can be programmed through the SPI, reference Table 48

Table 46. Power Switches Control Registers Structure and Bits Description

Name

Bits

Description

VPANEL33CNT (ADDR 0x4F - R/W - Default Value: 0x24)

CTLVPANEL33

2:0

VPNL33 State Control

x0 = Reserved

x1 = Reserved

x2 = Reserved

x3 = Reserved

x4 = OFF

x5 = Low Power

x6 = Active

x7 = Active

AOACCTLVPANEL33 5:3

VPNL33 State Control during AOAC Exit (when the Exit pin is EXITSTBY pin is asserted). These bits will be

initialized by the system SPI controller after power up.

X0 = Do not copy

x1 = Do not copy

x2 = Do not copy

x3 = Do not copy

x4 = OFF

x5 = Low Power

x6 = Active

x7 = Active

Reserved

7:6

Reserved

Table 47. Mask Register

ADDR

R/W

initial

PWRMASK

0x34

R/W

0x00

Table 48. Ramp Rate Control Registers (Freescale Defined)

Name

Bits

Description

FSLTONTCNTL1 (ADDR 0x1C8 - R/W - Default Value: 0xAA)

VCCTONT

1:0

Turn On Time Settings for VCC Regulator

x0 = 180 μs

x1 = 90 μs

x2 = 45 μs

x3 = 22 μs

VNNTONT

3:2

Turn On Time Settings for VNN Regulator

x0 = 180 μs

x1 = 90 μs

x2 = 45 μs

x3 = 22 μs

Power Supply Register Before Write

101

010

PWRMASK Register Settings

111

000

Example SPI Write to Power Supply

Power Supply Register After Write

101

111

900844 Datasheet(PDF) 83 Page - Freescale Semiconductor, Inc

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