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====== SMART Response XE Handheld PCB Pinouts ======

[[https://pastebin.com/raw/uFfBCQDG|Original]]

===== Test Points =====


TCK top left if oriented with SW1 on top of board

Layout:
  
  TCK   TMS   TDO    TDI
           RST   MISO
  SCK   GND   VCC    MOSI


   TCK - ATmega128RFA1 pin 3 [PF4:ADC4:TCK]
   SCK - ATmega128RFA1 pin 37 [PB1:SCK:PCINT1]
   TMS - ATmega128RFA1 pin 4 [PF5:ADC5:TMS]
   GND - GND
   RST - ATmega128RFA1 pin 12 [RSTN]
   TDO - ATmega128RFA1 pin 5 [PF6:ADC6:TDO]
   VCC - VCC (3.3V)
  MISO - ATmega128RFA1 pin 39 [PB3:MISO:PDO:PCINT3]
   TDI - ATmega128RFA1 pin 6 [PF7:ADC7:TDI]
  MOSI - ATmega128RFA1 pin 38 [PB2:MOSI:PDI:PCINT2]

   SCL - ATMega128RFA1 pin 25 [PD0:SCL:INT0], U5 pin 6
   SDA - ATMega128RFA1 pin 26 [PD1:SDA:INT1], U5 pin 7
  CLK0 - ATmega128RFA1 pin 53 [PE7:ICP3:INT7:CLKO], R29 to Display pin 6

===== ISP Pads =====

Pin 1 top left if oriented with SW1 on top of board

Layout:

  1 2
  3 4
  5 6

  - MISO, ATmega128RFA1 pin 39 [PB3:MISO:PDO:PCINT3] 
  - VCC (3.3V)
  - SCK, ATmega128RFA1 pin 37 [PB1:SCK:PCINT1] 
  - MOSI, ATmega128RFA1 pin 38 [PB2:MOSI:PDI:PCINT2]
  - RST, ATmega128RFA1 pin 12 [RSTN]
  - GND

===== JTAG Pads =====
 
Pin 1 bottom left if oriented with SW1 on top of board

Layout:

  2 4 6 8 10
  1 3 5 7 9

  - TCK, ATmega128RFA1 pin 3 [PF4:ADC4:TCK]
  - GND
  - TDO, ATmega128RFA1 pin 5 [PF6:ADC6:TDO]
  - VCC (3.3V)
  - TMS, ATmega128RFA1 pin 4 [PF5:ADC5:TMS]
  - RST, ATmega128RFA1 pin 12 [RSTN]
  - NC
  - NC
  - TDI, ATmega128RFA1 pin 6 [PF7:ADC7:TDI]
  - GND

===== RS232 pads =====

Pin 1 top left if oriented with SW1 on top of board

Layout:

  1 2
  3 4
  5 6

  - U6 pin 13
  - R36 to GND, U6 pin 1
  - U6 pin 8
  - R35 to VCC (3.3V)
  - GND, RS232 pad 6
  - GND, RS232 pad 5

===== Keyboard =====

Logical Layout (SK# are screen keys: top to bottom 1-5 on left, 6-10 on right):

        ROW1|ROW2|ROW3|ROW4|ROW5|ROW6|ROW7|ROW8|ROW9|ROW10
   COL1    1|   2|   3|   4|   5|   6|   7|   8|   9|   10
   COL2    Q|   W|   E|   R|   T|   Y|   U|   I|   O|    P
   COL3    A|   S|   D|   F|   G|   H|   J|   K|   L| Bksp
   COL4 Shft|   Z|   X|   C|   V|   B|   N|   M|Entr|   Up 
   COL5  Sym|Frac|Root| Exp| Spc|   ,|   .|Down|Left|Right
   COL6  SK1| SK2| SK3| SK4| SK5| SK6| SK7| SK8| SK9| SK10 

   COL1 - ATmega128RFA1 pin 26 [PD1:SDA:INT1], ATmega128RFA1 pin 52 [PE6:T3:INT6]
   COL2 - ATmega128RFA1 pin 43 [PB7:OC0A:OC1C:PCINT7]
   COL3 - ATmega128RFA1 pin 42 [PB6:OC1B:PCINT6] 
   COL4 - ATmega128RFA1 pin 41 [PB5:OC1A:PCINT5]
   COL5 - ATmega128RFA1 pin 40 [PB4:OC2A:PCINT4] 
   COL6 - ATmega128RFA1 pin 46 [PE0:RXD0:PCINT8], U6 (unpopulated) pin 9

   ROW1 - ATmega128RFA1 pin 50 [PE4:OC3B:INT4] 
   ROW2 - ATmega128RFA1 pin 64 [PF1:ADC1]
   ROW3 - ATmega128RFA1 pin 2 [PF3:ADC3:DIG4]
   ROW4 - ATmega128RFA1 pin48 [PE2:XCK0:AIN0] 
   ROW5 - ATmega128RFA1 pin 47 [PE1:TXD0], U6 (unpopulated) pin 11
   ROW6 - ATmega128RFA1 pin 32 [PD7:T0] 
   ROW7 - ATmega128RFA1 pin 14 [PG0:DIG3]
   ROW8 - ATmega128RFA1 pin 19 [PG5:OC0B]
   ROW9 - ATmega128RFA1 pin 30 [PD5:XCK1]
  ROW10 - ATmega128RFA1 pin 29 [PD4:ICP1]

===== Display =====

(P3) marked "S028HN118A VER:A1" reportedly an ST7586S display chip driving a 384x160 LCD display

Pin 1 on right if oriented with SW1 on top of board

  - VPP pad
  - ATmega128RFA1 pin 37 [PB1:SCK:PCINT1], ISP pad 3, Test Point SCK, U2 pin 6
  - ATmega128RFA1 pin 38 [PB2:MOSI:PDI:PCINT2], ISP pad 4, Test Point MOSI, U2 pin 5
  - R31 to ATmega128RFA1 pin 31 [PD6:T1] 
  - R30 to ATmega128RFA1 pin 16 [PG2:AMR]
  - R29 to ATmega128RFA1 pin 53 [PE7:ICP3:INT7:CLKO], CLK0 pad
  - EXT pad
  - VCC
  - C7 to C23 to Vin (6V)
  - GND
  - GND
  - VCC
  - C27 to C23 to Vin (6V)
  - C6 to Display pin 15
  - C6 to Display pin 14
  - C28 to C23 to Vin (6V)

===== SW1 =====

(Power Switch), Normally Open

Left and Right if oriented with SW1 on top of board

  L - GND
  R - ATmega128RFA1 pin 27 [PD2:RXD1:INT2], Z1 pin 1

===== Speaker =====

(unpopulated)

Pin 1 top if oriented with SW1 on top of board)

  - Speaker pin 2, Q1 (unpopulated) pin 2, R39 (unpopulated) to GND
  - Speaker pin 1, Q1 (unpopulated) pin 2, R39 (unpopulated) to GND
  - Speaker pin 4, R10 (unpopulated) to Q1 pin 1 + ATmega pin 49, R9 (unpopulated) to ?, C18 to GND
  - Speaker pin 3, D1 (unpopulated) pin 3 (D1 pin 1 to GND)

===== U1 - RF Switch =====

(Marked "G4J") possible high-frequency (RF) SPDT switch uPG2214TB

Pin 1 top right if oriented with SW1 on top of board

  - C39 to ANT1 (GND when board unpowered)
  - GND
  - C16 to ANT2 
  - ATmega pin 15, C35 to GND
  - unmarked Capactior (between U1 and C36) to C36 to GND - theoretically connected to ATMega pins 8 + 9 via a Balun, see ATmega datasheet section 9.8.3.2
  - ATmega pin 1, unlabeled capacitor to GND

===== U2 - SPI Flash =====

(Marked "ATMLH028 Z7H1164A") possible Two-Wire Serial EEPROM Atmel AT24C?

Pin 1 top right if oriented with SW1 on top of board

  - ATmega128RFA1 pin 28 [PD3:TXD1:INT3], CS_Flash pad
  - ATmega128RFA1 pin 39 [PB3:MISO:PDO:PCINT3], ISP pad 1, Test Point MISO
  - R17 to VCC (3.3V)
  - GND
  - ATmega128RFA1 pin 38 [PB2:MOSI:PDI:PCINT2], ISP pad 4, Test Point MOSI
  - ATmega128RFA1 pin 37 [PB1:SCK:PCINT1], ISP pad 3, Test Point SCK
  - R16 to C53 to GND
  - VCC (3.3V) 

===== U3 - ATmega128RFA1 =====

Pin 1 top right if oriented with SW1 on top of board

  - [PF2:ADC2:DIG2] - U1 pin 6 (possible RF switch)
  - [PF3:ADC3:DIG4] - Keyboard ROW3
  - [PF4:ADC4:TCK] - JTAG Pad 1, Test Point TCK
  - [PF5:ADC5:TMS] - JTAG Pad 5, Test Point TMS
  - [PF6:ADC6:TDO] - JTAG Pad 3, Test Point TDO
  - [PF7:ADC7:TDI] - JTAG Pad 9, Test Point TDI
  - [AVSS_RFP] - GND
  - [RFP] - theoretically connected to Balun to antenna switch, see ATmega datasheet section 9.8.3.2
  - [RFN] - theoretically connected to Balun to antenna switch, see ATmega datasheet section 9.8.3.2
  - [AVSS_RFN] - GND
  - [TST] - 
  - [RSTN] - ISP Pad 5, JTAG Pad 6, Test Point RST
  - [RSTON] - 
  - [PG0:DIG3] - Keyboard ROW7
  - [PG1:DIG1] - U1 pin 4 (possible RF switch)
  - [PG2:AMR] - Display pin 5
  - [PG3:TOSC2] - Y2 (32.768KHz crystal)
  - [PG4:TOSC1] - Y2 (32.768KHz crystal)
  - [PG5:OC0B] - Keyboard ROW8
  - [DVSS:DSVSS] - GND
  - [DVDD] - 
  - [DVDD] - 
  - [DEVDD] - VCC (3.3V)
  - [DVSS] - GND
  - [PD0:SCL:INT0] - U5 (unpopulated) pin 6, Test Point SCL
  - [PD1:SDA:INT1] - Keyboard COL1, U5 (unpopulated) pin 7, Test Point SDA -- Also pin 52
  - [PD2:RXD1:INT2] - SW1 Right Side (SW1 NO, closes to GND)
  - [PD3:TXD1:INT3] - U2 pin 1, CS_Flash
  - [PD4:ICP1] - Keyboard ROW10
  - [PD5:XCK1] - Keyboard ROW9 
  - [PD6:T1] - Display pin 4
  - [PD7:T0] - Keyboard ROW6
  - [CLKI] - 
  - [DEVDD] - VCC (3.3V)
  - [DVSS] - GND
  - [PB0:SSN:PCINT0] - 
  - [PB1:SCK:PCINT1] - Display pin 2, ISP Pad 3, U2 Pin 6, Test Point SCK
  - [PB2:MOSI:PDI:PCINT2] - Display Pin 3, ISP Pad 4, U2 Pin 5, Test Point MOSI
  - [PB3:MISO:PDO:PCINT3] - ISP Pad 1, U2 pin 2, Test Point MISO
  - [PB4:OC2A:PCINT4] - Keyboard COL5
  - [PB5:OC1A:PCINT5] - Keyboard COL4
  - [PB6:OC1B:PCINT6] - Keyboard COL3
  - [PB7:OC0A:OC1C:PCINT7] - Keyboard COL2
  - [DEVDD] - VCC (3.3V)
  - [DVSS] - GND
  - [PE0:RXD0:PCINT8] - Keyboard COL6, U6 (unpopulated) pin 9
  - [PE1:TXD0] - Keyboard ROW5, U6 (unpopulated) pin 11
  - [PE2:XCK0:AIN0] - Keyboard ROW4 
  - [PE3:OC3A:AIN1] - Q1 pin 1 (unpopulated transistor to drive Speaker pins 1,2), R10 (unpopulated) to Speaker pins 3,4
  - [PE4:OC3B:INT4] - Keyboard ROW1
  - [PE5:OC3C:INT5] - U5 (unpopulated) pin 5
  - [PE6:T3:INT6] - Keyboard COL1 -- Also pin 26
  - [PE7:ICP3:INT7:CLKO] - Display pin 6, Test Point CLK0
  - [DEVDD] - VCC (3.3V)
  - [DVSS] - GND
  - [XTAL2] - Y1 (marked T160 MSF9, 16MHz crystal?)
  - [XTAL1] - Y1 (marked T160 MSF9, 16MHz crystal?)
  - [AVSS:ASVSS] - GND
  - [EVDD] - VCC (3.3V)
  - [AVDD] -  
  - [AVSS] - GND
  - [AREF] - C17 (disconnected) to GND
  - [PF0:ADC0] - to Battery Voltage Divider (Vin - R4 z825 KOhm) - Pin63 - R5 (300 KOhm) - GND)
  - [PF1:ADC1] - Keyboard ROW2

===== U4 - DC-DC converter =====

(Marked "PHNI") 5-pin package, possible TPS62203DBV 3.3V DC-DC converter

Pin 1 bottom left if oriented with SW1 on top of board

Layout:

  5   4
  1 2 3

  - Vin (battery pack +, 6VDC nominal)
  - C23 to Vin (battery pack +, 6VDC nominal)
  - Vin (battery pack +, 6VDC nominal)
  - L3 to VCC (3.3V)
  - VCC (3.3V)

===== U5 =====

10-pin package outline

Pin 1 top left if oriented with SW1 on top of board

  - GND
  - NC
  - R13 (unpopulated) to U5 pin 5 + atmega pin 51
  - GND
  - ATmega128RFA1 pin 51 [PE5:OC3C:INT5], R13 (unpopulated) to U5 pin 3
  - ATMega128RFA1 pin 25 [PD0:SCL:INT0], SCL test point, R7 (4.7 KOhm) to VCC
  - ATMega128RFA1 pin 26 [PD1:SDA:INT1], ATmega128RFA1 pin 52 [PE6:T3:INT6], SDA test point
  - GND
  - VCC (3.3V), C19 to GND
  - NC

===== U6 =====

16-pin package outline (possibly intended to be a MAX3232 chip, but some pins are mixed up?)

Pin 1 bottom right if oriented with SW1 on top of board

  - R36 to GND, RS232 pad 2
  - C33 to pin 4
  - C41 to GND
  - C33 to pin 2
  - C42 to pin 6
  - C42 to pin 5
  - C43 to GND
  - RS232 pad 3
  - ATmega128RFA1 pin 46 [PE0:RXD0:PCINT8] -- Also used for Keyboard COL6
  - not connected ?
  - ATmega128RFA1 pin 47 [PE1:TXD0] -- Also used for Keyboard ROW5
  - pin 16
  - RS232 pad 1
  - C30 to pin 15
  - C30 to pin 14
  - pin 12, R37 to VCC (3.3V)