TMS320C5535 Datasheet, PDF (58/152 Pages) Texas Instruments – Fixed-Point Digital Signal Processors

TMS320C5535
TMS320C5534, TMS320C5533, TMS320C5532
SPRS737 – AUGUST 2011
15
Reserved
R-0
7
5
4
Reserved
WU_DOUT
R-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
3
WU_DIR
R/W-0
2
BG_PD
R/W-0
1
LDO_PD
R/W-0
Figure 4-1. RTC Power Management Register (RTCPMGT) [1930h]
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8
0
RTCCLKOUTEN
R/W-0
Table 4-2. RTCPMGT Register Bit Descriptions
BIT
NAME
DESCRIPTION
15:5
RESERVED Reserved. Read-only, writes have no effect.
Wakeup output, active low/open-drain.
4
WU_DOUT 0 = WAKEUP pin driven low.
1 = WAKEUP pin is in high-impedance (Hi-Z).
Wakeup pin direction control.
0 = WAKEUP pin configured as a input.
1 = WAKEUP pin configured as a output.
3
WU_DIR
Note: When the WAKEUP pin is configured as an input, it is active high. When the WAKEUP pin is
configured as an output, is an open-drain that is active low and should be externally pulled-up via a
10-kΩ resistor to DV_DDRTC. WU_DIR must be configured as an input to allow the WAKEUP pin to
wake the device up from idle modes.
Bandgap, on-chip LDOs, and the analog POR power down bit.
This bit shuts down the on-chip LDOs (ANA_LDO, DSP_LDO, and USB_LDO), the Analog POR,
and Bandgap reference. BG_PD and LDO_PD are only intended to be used when the internal
LDOs supply power to the chip. If the internal LDOs are bypassed and not used then the BG_PD
and LDO_PD power down mechanisms should not be used since POR gets powered down and the
POWERGOOD signal is not generated properly.
2
BG_PD
After this bit is asserted, the on-chip LDOs, Analog POR, and the Bandgap reference can be
re-enabled by the WAKEUP pin (high) or the RTC alarm interrupt. The Bandgap circuit will take
about 100 msec to charge the external 0.1 uF capacitor via the internal 326-kΩ resistor.
0 = On-chip LDOs, Analog POR, and Bandgap reference are enabled.
1 = On-chip LDOs, Analog POR, and Bandgap reference are disabled (shutdown).
On-chip LDOs and Analog POR power down bit.
This bit shuts down the on-chip LDOs (ANA_LDO, DSP_LDO, and USB_LDO) and the Analog
POR. BG_PD and LDO_PD are only intended to be used when the internal LDOs supply power to
the chip. If the internal LDOs are bypassed and not used then the BG_PD and LDO_PD power
down mechanisms should not be used since POR gets powered down and the POWERGOOD
1
LDO_PD
signal is not generated properly.
After this bit is asserted, the on-chip LDOs and Analog POR can be re-enabled by the WAKEUP
pin (high) or the RTC alarm interrupt. This bit keeps the Bandgap reference turned on to allow a
faster wake-up time with the expense power consumption of the Bandgap reference.
0 = On-chip LDOs and Analog POR are enabled.
1 = On-chip LDOs and Analog POR are disabled (shutdown).
Clockout output enable bit.
0
RTCCLKOUTEN 0 = Clock output disabled.
1 = Clock output enabled.
58
Device Configuration
Copyright © 2011, Texas Instruments Incorporated
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