ࡱ> q` R'\bjbjqPqP2`::L0$0O#^"""""""$$h='"-" #"" 2 #0O#'.('($ ""O#000  000000 SD20 - 20 Channel I2C to Servo Driver Chip  INCLUDEPICTURE "http://www.robot-electronics.co.uk/images/sd20.jpg" \* MERGEFORMATINET  The SD20 chip is a pre-programmed PIC16F872 running at 8MHz. Position commands for up to 20 servo's are sent to the chip over the I2C bus. Features Include; Easy I2C bus control, same protocol as popular EEPROM's such as 24C02 Position Control of up to 20 Servo's Servo's inactive at power up until first position sent to it Scan time is 20mS minimum, then proportional to the total number of servo's used. Buffer can be read as well as written saving valuable memory resources on small controllers. Standard mode - 256 bit resolution from 1mS to 2mS. Expanded mode - Allows pulse to exceed 1mS to 2mS range for greater movement. 0.5uS Timer produces jitter free outputs. Connection Diagram showing example connection to OOPic.  INCLUDEPICTURE "http://www.robot-electronics.co.uk/images/sd20.GIF" \* MERGEFORMATINET  Register Usage RegisterFunction0Software Revision Number1Servo1 Position2Servo2 Position3Servo3 Position4Servo4 Position5Servo5 Position6Servo6 Position7Servo7 Position8Servo8 Position9Servo9 Position10Servo10 Position11Servo11 Position12Servo12 Position13Servo13 Position14Servo14 Position15Servo15 Position16Servo16 Position17Servo17 Position18Servo18 Position19Servo19 Position20Servo20 Position21Standard/Expanded Mode Control22-23Expanded mode offset - 16bit register, high byte first24 - 31Unused bytes - available to userStandard mode This is the power-up state. The servo range is the standard 1mS to 2mS. You can restore this mode, if you have changed it, by writing 0 (zero) to register 21. Writing values from 1 - 255 (0x01 - 0xff) will produce a pulse range as described in Expanded Mode below. Expanded mode Be careful with this, as it is easy to cause the servo to hit its stops. This mode globally allows an expanded range of movement of the servo's. Writing any value greater than zero to register 21 will set Expanded Mode. The actual value written sets the range of the pulse width according to the following formula; Range Width (uS) = (255 * 256) / Reg21 where Range Width is the Variation in the width. So for example, if Reg21 is set to 65 the the maximum variation in pulse width will be; (255*256)/65 = 1004uS = 1.004mS. This is just the variation in range, for an actual range of 1mS to 2mS an offset needs to be added to this. The offset is contained in register 22-23 and is; (Reg22:23 +20) (uS) So if Reg22:22 is set to 980 then the offset will be 980+20 = 1000uS = 1mS. Therefore the pulse will vary from 1mS to 2mS. This is the same as the standard range. The total pulse width is; Pulse Width (uS) = ((255 * 256) / Reg21) + (Reg22:23 + 20) Values of 43 and 820 will give a range of 0.84mS to 2.36mS. This is a good wide range on the HS300 servo. Scan Time This is the refresh time between pulses to a servo. No servo is active until its position is set. The refresh period for the servos depends on the number in use and their pulse width. It is maintained at 20mS as far as possible. When the required time exceeds 20mS then it expands as required, according to the number of servo's used and their pulse widths. Any SD20 channels may be chosen, because unused channels do not add to the scan time. You don't have to start with position 1. On Rev1 devices, writing 0 to a servo will move it to the minimum position, on Rev2 devices, writing 0 will de-activate the servo. This allows a servo to be powered down by removing drive pulses. Software Revision Number Register 0 is loaded with the software revision number after a power-up. It can be over-written and the register used as an additional byte if required. Address The SD20 Servo chip is located at address 0xC2 on the I2C bus. Example Code The following code demonstrates the SD20 used with the OOPic. 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