THEORY OF OPERATION Chapter 2
2 - 13
J14-8 is “CTS” and is ESD protected by R17, C24 and U6D.
J14-9 is an NC.
• VPP[12V](IN)
J11-6 is “VPP[12V](IN)”. It is ESD protected by Z1 and C1. C9 provides filtering of line
transients. The VPP line is terminated to ground by R4 and isolated from U3F-14 by R9.
U3F-15 provides the signal “MAS_EA*” to J2-5. This line provides the programming
voltage for reprogramming the FLASH memory of the device.
2.2.11 Analog Board
2.2.11.1 Motor Drive Electronics
• H-Bridge drive electronics
The motor drive on the pump is accomplished by a MOSFET H-Bridge Power amplifier
comprised of Q6, Q7 (PMOS), Q8, Q9 (NMOS).
2.2.12 Digital Board
The digital board contains most of the digital circuitry for the pump including its
microprocessors.
2.2.12.1 Keyboard Interface
The keypad is a matrix of switches created by a sandwiched array of silver polyester
circuits and an elastomer cover. The switch functions of the keypad are arranged as
follows:
Col 3 Col 2 Col 1 Col 0
Row 0 “7” “8” “9” “BOLUS”
Row 1 “4” “5” “6” “EDIT”
Row 2 “1” “2” “3” “LOCK”
Row 3 “0” “.” “CONFIRM”
Row 4 “START” “STOP”
Row 5
“∆” “∇“
“PURGE” “CLR”
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