c644ultrt Semtech Corporation, c644ultrt Datasheet
c644ultrt
Related parts for c644ultrt
c644ultrt Summary of contents
Page 1
... SPIF 4.7µF BL1 BL2 BYP BL3 BL4 BL5 AGND BL6 PGND LDO1 LDO2 LDO3 LDO4 1.0µF 1.0µF 2.2µF 2.2µF © 2009 Semtech Corporation SC644 ® Interface ® single wire Sub Main Backlight Backlight V = 1.5V to 3.3V LDO1 V = 1.2V to 1.8V LDO2 V = 1.5V to 3.3V LDO3 Motor 1.0µF 1.0µ ...
Page 2
... JA Marking Information 644 yyww xxxx yyww = Date Code xxxx = Semtech Lot No. Ordering Information Device SC644ULTRT 16 SC644EVB Notes: LDO1 15 () Available in tape and reel only. A reel contains 3,000 devices. (2) Lead-free packaging only. Device is WEEE and RoHS compliant, LDO2 14 and halogen free. ...
Page 3
Absolute Maximum Ratings IN, OUT ( ...
Page 4
Electrical Characteristics (continued) Parameter Charge Pump Electrical Specifications (Cont.) .5x Mode to 2x Mode Falling Transition Voltage 2x Mode to .5x Mode Hysteresis Current Sink Off-State Leakage Current Pump Frequency LDO Electrical Specifications LDO, LDO3, and LDO4 Voltage Setting Range ...
Page 5
Electrical Characteristics (continued) Parameter Digital I/O Electrical Specifications (SPIF) Input High Threshold (9) Input Low Threshold (9) Input High Current Input Low Current SemPulse Electrical Specifications (SPIF) SemPulse Start-up Time (0) Bit Pulse Duration (9) Duration Between Bits (9) Hold ...
Page 6
Typical Characteristics Battery Current (6 LEDs) — 25mA Each V = 3.50V 150mA, 25 °C OUT OUT 300 260 220 180 140 100 4.2 3.9 3.6 V (V� IN Battery Current (6 LEDs) — 12mA Each V = ...
Page 7
Typical Characteristics (continued) PSRR vs. Frequency — 1.8V V =3.7V, V =1.8V 50mA IN OUT OUT 0 -10 -20 -30 -40 -50 -60 -70 10 100 Frequency (Hz� Line Regulation (LDO2 1mA 1.2V and ...
Page 8
Typical Characteristics (continued) Load Regulation (LDO2) V =3.6V, 25° 1.2V -10 -15 -20 - (mA� LDO LDO Load Transient Response (3.3V) V =3.7V, V =3.3V 00mA, 25°C IN LDO LDO ...
Page 9
Typical Characteristics (continued) Ripple — 1X Mode V =3.8V, 6 Backlights — each, 25° (00mV/div (00mV/div) OUT I (20mA/div) BL Time (20µ���i�� ���i�� ��i�� Ripple — 2X Mode V =2.9V, 6 Backlights — 5 ...
Page 10
Pin Descriptions Pin # Pin Name IN 2 PGND 3 BL3 4 BL2 5 BL 6 BL4 7 BL5 8 BL6 9 AGND 0 LDO4 LDO3 2 SPIF 3 BYP 4 LDO2 5 LDO 6 OUT 7 C2+ ...
Page 11
Block Diagram SPIF 12 SemPulse Digital Interface and Logic Control LDO BYP 13 Voltage Reference 2 PGND AGND 9 C2+ C1+ C1- C2 Fractional Charge Pump (1x, 1.5x, 2x) Oscillator Current Setting ...
Page 12
Applications Information General Description This design is optimized for handheld applications sup- plied from a single cell Li-Ion and includes the following key features: • A high efficiency fractional charge pump that supplies power to all LEDs • Six matched ...
Page 13
Applications Information (continued) Main and Sub Backlight Bank Configuration The six LED backlight drivers can be configured as a single bank or as two independent banks — one dedicated for a main display and the other for a sub display. ...
Page 14
Applications Information (continued) Table 1 — Fade-In from Off State Command Action Sequence . Disable fade for Write to register 09h the bank 2. Set Main and/or Write to register 0h Sub backlights to and or 02h () 0.5mA 3. ...
Page 15
Applications Information (continued) Protection Features The SC644 provides several protection features to safe- guard the device from catastrophic failures. These features include: • Output Open Circuit Protection • Over-Temperature Protection • Charge Pump Output Current Limit • LDO Current Limit ...
Page 16
Applications Information (continued) PCB Layout Considerations The layout diagram in Figure 2 illustrates a proper two- layer PCB layout for the SC644 and supporting components. Following fundamental layout rules is critical for achieving the performance specified in the Electrical Characteristics ...
Page 17
SemPulse Interface Introduction SemPulse is a write-only single wire interface. It provides access registers that control device functional- ity. Two sets of pulse trains are transmitted to generate a complete SemPulse command. The first pulse ...
Page 18
SemPulse Interface (continued) SemPulse Timing Diagrams The SemPulse single wire interface is used to enable or disable the device and configure all registers (see Figure 5). The timing parameters refer to the digital I/O electrical specifications. SPIF t = ...
Page 19
Register Map (1) Address D5 D4 (2) 00h BL6EN BL5EN 0h 0 (3) MBL4 02h 0 SBL4 (3) 05h 0 0 (3) (3) 06h 0 0 (3) (3) 07h 0 0 (3) (3) 08h 0 0 (3) (3) 09h SFADE ...
Page 20
Register Map (continued) MBL4 through MBL0 [D4:D0] These bits are used to set the current for the main back- light current sinks. All enabled current sinks will sink the same current as shown in Table 4. Table 4 — Main ...
Page 21
Register Map (continued) SBL4 through SBL0 [D4:D0] These bits are used to set the current for the sub backlight current sinks. All enabled current sinks will sink the same current as shown in Table 5. Table 5 — Sub Backlight ...
Page 22
Register Map (continued) LDO2 Control Register (06h) This register is used to enable LDO2 and set its output voltage level. Bits [D5:D3] These bits are unused and are always zeroes. LDO2V2 through LDO2V0 [D2:D0] These bits are used to set ...
Page 23
Register Map (continued) LDO4 Control Register (08h) This register is used to enable LDO4 and set its output voltage level. Bits [D5:D4] These bits are unused and are always zeroes. LDO4V3 through LDO4V0 [D3:D0] These bits are used to set ...
Page 24
Register Map (continued) SFADE1 and SFADE0 [D5:D4] These bits are used to set the rise/fall rate between two backlight currents for the sub display as show in Table . For the fade feature to be active, the SFADE bit must ...
Page 25
Outline Drawing — MLPQ-UT-20 3x3 A PIN 1 INDICATOR (LASER MARK) A aaa NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS THE ...
Page 26
Land Pattern — MLPQ-UT-20 3x3 NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE ...