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Figure 5-4.
Configurable Static Mode
D1
D2
D3
D4
ITB/RDY
POK
0
1
Power OK
The state of each channel is determined by the internal state machine during the start-up
sequence. POK is looped back onto ITB/RDY. When this signal changes from 0 to 1 (i.e., the
start-up is completed), the control of each supply channel is passed on to D1-D4. This allows
changing the output values defined by the state machine. This mode can be used when the 4th
channel is needed.
Figure 5-5.
GPIO (μC Controlled)
D1
D2
I/O
I/O
D3
I/O
μC
D4
ITB/RDY
POK
I/O
I/O
RST or NMI
When the system is powered, the microcontroller is not necessarily well configured and may be
unable to drive D1-D4 correctly. Since ITB/RDY is not actively controlled, its state is an unknown
logic level. If ITB/RDY is in hi-Z, the weak internal pullup pulls the level to 1. The power channels
are controlled by the internal state machine. After some initialization time, the microcontroller
configures its GPIOs to drive D1-D4 as wished. At the end of the software configuration, the
microcontroller changes the level of ITB/RDY to 0 in order to get control on the four power chan-
nels through D1-D4.
5.3.2
14
Dynamic Mode
For the devices of the AT73C224-x family that work in dynamic mode, supply management can
be performed by the SPI or TWI digital interface. Selection between the two digital interfaces is
done through D4 pin when the AT73C224-x is enabled. Pin D4 is a digital input pin that features
a controllable pull-up resistor with active low control signal. When the AT73C224-x starts, the
pullup is disabled until a push button event is detected. The state machine enables the pull-up
resistor on D4, waits for a time and then checks back on the value on the pad.
? If D4 is high (i.e., the level externally applied on D4 is HZ or logic 1), SPI interface is selected.
D4 will become SCS.
? If D4 is low (i.e., D4 is externally grounded), TWI interface is selected. D4 is not used.
After signal dynamic has been determined the state machine disables the pull-up resistor to
save power and the D4 pin can be normally used (if SPI has been selected).
AT73C224
6266A–PMAAC–08-Sep-08
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制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management and Analog Companions (PMAAC)
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制造商:ATMEL 制造商全称:ATMEL Corporation 功能描述:Power Management and Analog Companions (PMAAC)
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