78M6618-M/F/P2 Datasheet 78M6618-SOCKET68, 78M6618-IM/F, 78M6618-IMR/F | P13-P15

DS_6618_005 78M6618 Data Sheet

Rev. 1.4 13

1.20 UARTs

The 78M6618 includes two UARTs (UART0 and UART1) that can be programmed to communicate with a

variety of external devices. The UARTs are dedicated 2-wire serial interfaces, which can communicate at

rates up to 38,400 bits/s. All UART transfers are programmable for parity enable, parity, 2 stop bits/1

stop bit and XON/XOFF options for variable communication baud rates from 300 to 38,400 bps. See the

78M6618 Programmer’s Reference Manual for more information regarding the use of the UART

resources.

1.20.1 UART1 (OPT_TX/OPT_RX)

The device includes an interface to implement an IR/optical port on UART1. The pin OPT_TX is

designed to directly drive an external LED for transmitting data on an optical link. The pin OPT_RX has

the same threshold as the RX(UART0) pin, but can also be used to sense the input from an external

photo detector used as the receiver for the optical link. Alternately, the UART1 may be interfaced with a

standard level UART transceiver. Contact Teridian support for more information.

1.21 In Circuit Emulator (ICE) Port

The 78M6618 implements an In Circuit Emulator(ICE) port for debug and programming of the device. To

enable the use of the port the ICE_E pin must be pulled high. In this mode the SEG11,SEG10 and SEG9

pins are repurposed and the E_RST, E_TCLK and E_RXTX pins respectively. Please contact Teridian

support for more information regarding the use of the ICE interface for device programming and debug.

78M6618 Data Sheet DS_6618_005

14 Rev. 1.4

2 Electrical Specifications

2.1 Absolute Maximum Ratings

Table 2 shows the absolute maximum ranges for the device. Stresses beyond Absolute Maximum

Ratings may cause permanent damage to the device. These are stress ratings only and functional

operation at these or any other conditions beyond those indicated under recommended operating

conditions (Section 4.3) is not implied. Exposure to absolute-maximum-rated conditions for extended

periods may affect device reliability. All voltages are with respect to GNDA.

Table 2: Absolute Maximum Ratings

Voltage and Current

Supplies and Ground Pins

V3P3SYS, V3P3A -0.5 V to 4.6 V

VBAT -0.5 V to 4.6 V

GNDD -0.5 V to +0.5 V

Analog Output Pins

V3P3D

-10 mA to 10 mA,

-0.5 V to 4.6 V

VREF

-10 mA to +10 mA,

-0.5 V to V3P3A+0.5 V

V2P5

-10 mA to +10 mA,

-0.5 V to 3.0 V

Analog Input Pins

IA, IB, IC, ID, IE, IF, IG, IH, VA, VB, V1

-10 mA to +10 mA

-0.5 V to V3P3A+0.5 V

XIN, XOUT

-10 mA to +10 mA

-0.5 V to 3.0 V

All Other Pins

Configured as SEG or COM drivers

-1 mA to +1 mA,

-0.5 to V3P3D+0.5

Configured as Digital Inputs

-10 mA to +10 mA,

-0.5 to 6 V

Configured as Digital Outputs

-15 mA to +15 mA,

-0.5 V to V3P3D+0.5 V

All other pins -0.5 V to V3P3D+0.5 V

Temperature and ESD Stress

Operating Junction Temperature (peak, 100ms) +140°C

Operating Junction Temperature (continuous) +125°C

Storage Temperature Range -45°C to +165°C

Lead Temperature (soldering, 10s)

+300°C

Soldering Temperature (reflow) +260°C

ESD Stress on All Pins ±4kV

DS_6618_005 78M6618 Data Sheet

Rev. 1.4 15

2.2 Recommended External Components

Table 3: Recommended External Components

Name From

To Function Value Unit

C1 V3P3A AGND Bypass capacitor for 3.3 V supply

≥0.1 ±20% µF

C2 V3P3D DGND Bypass capacitor for 3.3 V output

0.1 ±20% µF

CSYS V3P3SYS DGND Bypass capacitor for V3P3SYS

≥1.0 ±30% µF

C2P5 V2P5 DGND Bypass capacitor for V2P5

0.1 ±20% µF

XTAL XIN XOUT

32.768 kHz crystal – electrically similar to

ECS .327-12.5-17X or Vishay XT26T,

load capacitance 12.5 pF.

32.768 kHz

CXS XIN AGND

Load capacitor for crystal (depends on

crystal specs and board parasitics).

33 ±10%

CXL XOUT AGND

Load capacitor for crystal (depends on

crystal specs and board parasitics).

15 ±10%

Notes:

1. AGND and DGND should be connected together.

2. V3P3SYS and V3P3A should be connected together.

2.3 Recommended Operating Conditions

Table 4: Recommended Operating Conditions

Parameter Condition Min Typ Max Unit

V3P3SYS, V3P3A: 3.3 V Supply Voltage

V3P3A and V3P3SYS must be at the

same voltage

Normal Operation 3.0 3.3 3.6 V

Battery Backup 0 3.6 V

VBAT No Battery Externally Connect to V3P3SYS

Battery Backup:

BRN and LCD modes

SLEEP mode

3.0

2.0

3.8

Operating Temperature -40 +85 ºC

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P32

78M6618-M/F/P2

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Maxim Integrated

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IC PWR MEASUREMENT OCTAL 68QFN

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78M6618-M/F/P2

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