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L8202 ,MULTIFUNCTION ANALOG ASICFEATURESFigure 1. Package■ Flexible Motor Driver configuration– 4 DC Motor drivers (1.5A Peak Curre ..
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L8202
MULTIFUNCTION ANALOG ASIC
1/15
L8202February 2005
FEATURES Flexible Motor Driver configuration 4 DC Motor drivers (1.5A Peak Current) or 2 DC Motor drivers & 1 Dual Full Bridge Step-
per Motor driver 2 Switching Voltage regulators 6 Open Drain Drivers Serial Input Port 4 Operational amplifiers Low voltage Supervisor Thermal Protection
DESCRIPTIONL8202 is a multifunction analog ASIC designed for
MFP Inkjet printer applications.
L8202 integrates 4 full H Bridge drivers, 2 switch-
ing Buck type voltage regulators, 4 operational
amplifiers, 6 open drain drivers, Reset Generation
circuitry and over temperature protection circuitry.
The regulated Voltages are: VCC that can be ei-
ther 3.3V or +5V and VDD, programmable by a re-
sistor divider network from +3V to +17V
It is possible to increase the Output Current capa-
bility of the VDD regulator by adding an external
discrete Power DMOS.
An internal regulator is present in the IC in order to
supply several internal blocks. The 5V output volt-
age is filtered on pin V5 (Typical filter capacitor =
100nF) .
MULTIFUNCTION ANALOG ASIC
Figure 2. Block DiagramRev. 2
L8202
Table 2. Pin Description
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L8202
Table 2. (continued)
L8202
Table 3. Absolute Maximum Ratings
Table 4. Recommended Operating Conditions (Tj = 25°C, VS= 32V, unless otherwise specified)
Figure 3. Pin Connections
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L8202 SERIAL INTERFACE L8202 Analog ASIC integrates an SPI interface (write only) for data exchange with the Digital ASIC.
The Input word is 19 bits long.
3 Input Pins are dedicated to the Serial Interface: nCS (Chip Select, active Low), SDI (Serial Data In),
SCLK (Serial Clock). nCS must be pulled low to activate a Serial Input command.
Data present at the SDI pin are shifted into the L8202 on the 19 rising edges of SCLK.
The first bit present at the SDI, after the nCS is pulled low, and shifted into the L8202 at the first SCLK
rising edge is the LSB. ( SDI will remain at the value presented with the last bit of data ). The low to high
transition of nCS, after the 19th Sclk rising edge, loads the data into the internal L8202 ASIC input register.
The serial interface is cleared by nRESET.
Figure 4. SPI Operation
Table 5. SPI Timing specifications (Tamb = 25 °C, VS = 32 V, unless otherwise specified)
L8202
Table 6. SPI Bit Definition
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L8202 DC/DC CONVERTERS SPECIFICATIONL8202 contains 2 DC/DC converters.
VCC converter is programmable by the Vcc_Select pin for an Output Voltage rated at 3.3V or 5V (1.2A
max.). VDD voltage is programmable by a resistor divider network to voltages from +3V to +17V.
The switching frequency of the two converters is 200KHz.
The Vcc and the VDD regulators are protected by thermal protection circuit with thermal hysteresys (Out-
put Voltages are switched off during thermal protection event). The output voltages, Vcc and VDD are
short circuit protected.
4.1 VCC Regulator
Table 7. Electrical Characteristcs (Tj = 25 °C, VS = 32 V, unless otherwise specified)
4.2 VDD Regulator
Table 8. Electrical Characteristcs (Tj = 25 °C, VS = 32 V, unless otherwise specified)
L8202 DC MOTOR DRIVERS OPERATIONSL8202 provides PWM bi-directional drive for two DC motors.
The PWM modulation is provided by the MDx_PWM input, and the current direction into the motor by the
MDCx_D bit in the serial input port.
The driver is protected versus overloads on the output lines to a max. current of 2 Amps peak.
The current protection circuit is implemented only on the High Side Drivers, so current protection is pro-
vided to motor currents only, but not to shorts between Motor Outputs to GND or Vs.
A blanking period following a current turn-on event is included to prevent false current protection.
The H Bridges are protected versus cross-conduction.
Thermal protection with hysteresys is provided to the Motor Drivers.
During thermal protection event the Bridge Outputs are forced into a high impedance status.
If nReset is low the motor drive outputs are forced in high impedance
Table 9. Absolute Maximum Ratings (Tj = 25°C, VS = 32V, unless otherwise specified)
Table 10. Electrical Characteristcs (Tj = 25 °C, VS = 32 V, unless otherwise specified)
Table 11. Truth Table
