mc68hc705v12 Freescale Semiconductor, Inc, mc68hc705v12 Datasheet - Page 206

• Manufacturer Part Number: mc68hc705v12
• Description: M68hc05-based Mcu Hc05 Freescale Semiconductor
• Manufacturer: Freescale Semiconductor, Inc

Gauge Drivers
15.10 Gauge Regulator Accuracy
15.11 Coil Current Accuracy
Advance Information
NOTE:
The V
stability. In addition, the V
To provide effective decoupling and to reduce radiated RF emissions,
the small decoupling capacitors must be located as close to the supply
pins as possible. The self-inductance of these capacitors and the
parasitic inductance and capacitance of the interconnecting traces
determine the self-resonant frequency of the decoupling network. Too
low a frequency will reduce decoupling effectiveness and could increase
radiated RF emissions from the system. A low-value capacitor (470 pF
to 0.01 F) placed in parallel with the other capacitors will improve the
bandwidth and effectiveness of the network.
The on-chip portion of the regulator will contribute no more than E
percent to the variation in the V
come from the tolerances in the R
The accuracy of the current flowing between the + and – coil pins of a
particular coil driver pin pair is described here.
Matching of currents between coils within the same gauge is specified in
17.11 Gauge Driver Electricals
The absolute accuracy of the coil current that can be driven into any coil
is determined by the accuracy of I
Gauge Regulator Accuracy
Because the D/A amp is shared among all coil drivers and between both
sets of drivers in the full H-bridge drivers, there will be no difference in
the magnitude of the current when the magnitude register value remains
constant and only the polarity bit is changed in a coil driver.
F bypass capacitors to V
Freescale Semiconductor, Inc.
For More Information On This Product,
GSUP
pin requires a 100 F low ESR capacitor for regulator
Go to: www.freescale.com
Gauge Drivers
DD
SS
and V
and V
and will be a total of (E
GSUP
as E
CM
G1
CCA
SSA
and R
voltage. The remaining errors will
given by the equations in
CM
pins should have the usual 0.1
respectively.
.
G2
resistors off-chip.
MC68HC705V12
CA
+ E
MAX
—
15.10
).
Rev. 3.0
GS