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C8051F91x/90x
6. What can I do to reduce active supply current?
Below are some suggestions for reducing the active supply current:
a. Clear all wake-up sources in the PCU0CF register. This will allow the low power oscillator to be
disabled when it is not being used as the system clock. This optimization can reduce the supply
current by up to 30 μA.
b. When operating at system clock frequencies above 10 MHz, minimize supply current by setting the
BYPASS bit (FLSCL.6) to 1. If the system clock needs to decrease below 10 MHz, clear the BYPASS
bit to 0.
c. If the precision oscillator is not being used, turn off the precision oscillator bias by setting the OSCBIAS
bit (REG0CN.4) to 0.
7. Why does P0.7/IREF0 have a voltage of 200 mV when IREF0CN is set to 0x00?
When IREF0CN is set to 0x00, the current reference is completely turned off. When a shorting block is
installed on J7, the voltage at P0.7/IREF0 should be 0 V unless one of the following conditions is present:
a. The P0.7/IREF0 pin is not configured for analog I/O (weak pull-up enabled).
b. The P0.7/IREF0 pin is being used as CTS (a shorting block is installed on J12).
8. I have configured a Port pin as an analog input. Why is it still shorted to ground?
On C8051F91x-C8051F90x devices, configuring a Port pin to analog mode (using PnMDIN) disables the
digital input path and the weak pull-up. It does not explicitly disable the output drivers.
Software can ensure that the output drivers are disabled by configuring the Port pin to open-drain output
mode (using PnMDOUT) and writing 1 to the port latch.
9. Why does power consumption increase when an analog signal (hovering around mid-supply) is
connected to a digital input?
This phenomenon is called the “crowbar” effect and is present in all CMOS circuitry. If the input of a CMOS
structure is not a strong 1 or 0, then both the PMOS and NMOS devices are partially turned on causing
current flow from VDD to GND.
To prevent the “crowbar” effect, ensure that pins with analog voltage levels are configured for analog I/O.
10. Why does the dc/dc converter stop regulating when the load current exceeds 10 mA?
The default register settings for the dc/dc converter are optimized for low power applications requiring less
than 10 mA of supply current. If the application requires additional supply current, the default values may
be overridden to provide up to 65 mW of output power.
To configure the dc/dc converter to high power mode, perform the following steps prior to enabling any high
power device:
a. Set DC0CN = 0x01. This selects the high-current switches.
b. Set DC0CF = 0x04. This sets the peak inductor current limit to 500 mA.
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