SS1621 ETC, SS1621 Datasheet
SS1621
Available stocks
Related parts for SS1621
SS1621 Summary of contents
Page 1
... S/W configuration feature of the SS1621 makes it suitable for multiple LCD applications including LCD modules and display subsystems. Only three or four lines are required for the interface be- tween the host controller and the SS1621. The SS1621 contains a power down command to reduce power consumption. ...
Page 2
... IRQ : Time base or WDT overflow output COM0~COM3, SEG0~SEG31: LCD outputs Watchdog Timer Tone Generator Time Base Generator Control Logic & Timing Generator Display Memory p. 2 & IRQ VLCD COM0 COM3 LCD Driver & SEG0 Bias Circuit SEG31 Last update: 2008-06-03 04:36 SS1621 ...
Page 3
... Pin Assignment SS1621B-48SSOP SS1621B -48LQFP SS1621D-28SKDIP SS1621BL -48LQFP p. 3 Last update: 2008-06-03 04:36 SS1621 ...
Page 4
... WRITE clock input with pull-high resistor WR I Data on the DATA line are latched into the SS1621 on the rising edge of the WR signal. DATA I/O Serial data input/output with pull-high resistor GND — ...
Page 5
... =2. =4 =0. =0. =2. =4 DATA SS1621 ° 125 ° Min. Typ. Max. Unit 2.4 — 5.2 V — 150 300 µA — 300 600 µA — 60 120 µA — 120 240 µA — ...
Page 6
... Write mode 3V Read mode Write mode 5V Read mode 3V — — — — — SS1621 Min. Typ. Max. Unit — 256 — kHz — 256 — kHz — 32.768 — kHz — 32.768 — kHz — 256 — ...
Page 7
... DD GND the READ-MODIFY-WRITE commands. The following is a mapping from the RAM to the LCD pattern: System oscillator The SS1621 system clock is used to generate the time base/Watchdog Timer 0 (WDT) clock frequency, LCD driving clock, 1 and tone frequency. The source of the clock 2 may be from an on-chip RC oscillator ...
Page 8
... In this case, the system fails to enter the power down mode, similar to the case in the external 256kHz clock source operation. At the initial system power on, the SS1621 is at the SYS DIS state. Time base and Watchdog Timer (WDT) The time base generator is comprised by an 8-stage count-up ripple counter and is de- signed to generate an accurate time base ...
Page 9
... S/W setting. There are two mode commands to configure the SS1621 resources and to transfer the LCD display data. The configura- tion mode of the SS1621 is called command mode, and its command mode IC is 100 . The command mode consists of system configura- tion command, a system frequency selection ...
Page 10
... ID should be issued first. Interfacing Only four lines are required to interface with the SS1621. The CS line is used to ini- tialize the serial interface circuit and to ter- minate the communication between the host controller and the SS1621. If the CS pin is ...
Page 11
... Data (MA) Data (MA+ Memory Address 2 (MA2) Data (MA2) Data (MA+2) Data (MA+3) Data (MA+2) Data (MA+ Memory Address 2 (MA2) Data (MA2) Last update: 2008-06-03 04:36 SS1621 ...
Page 12
... Data (MA) Data (MA+1) Data (MA+ Command… Command or Address & Data Data Mode Data (MA+2) Data (MA+ Command i Command or Data Mode Command or Address & Data Data Mode Last update: 2008-06-03 04:36 SS1621 ...
Page 13
... Application Circuits Host controller with a SS1621 display system μC Clock Out External Clock 1 External Clock 2 On-chip OSC Crystal 32768Hz Note: The connection of IRQ and RD pin can be selected depending on the requirement of the μC. The voltage applied to V Adjust VR to fit LCD display Adjust R (external pull-high resistance) to fit user’ ...
Page 14
... C Tone frequency, 4kHz C Tone frequency, 2kHz C Disable IRQ output C Enable IRQ output Time base/WDT clock C Output: 1Hz The WDT time-out flag after Time base/WDT clock Output: 2Hz p. 14 SS1621 Function Def. Yes Yes Yes Yes Yes Last update: 2008-06-03 04:36 ...
Page 15
... Calculation of the frequency is based on the system frequency sources as stated above recommended that the host controller should initialize the SS1621 after power on reset, for power on reset may fail, which in turn leads to the malfunctioning of the SS1621. ...