DS5003 Datasheet, PDF (12/24 Pages) Maxim Integrated Products – Secure Microprocessor Chip

Secure Microprocessor Chip
Pin Description
PIN
NAME
FUNCTION
POWER PINS
13
V_CC
Power Supply, +5V
V_CC Output. This is switched between V_CC and V_LI by internal circuits based on the level of V_CC.
12
V_CCO
When power is above the lithium input, power is drawn from V_CC. The lithium cell remains
isolated from a load. When V_CC is below V_LI, V_CCO switches to the V_LI source. V_CCO should be
connected to the V_CC pin of an SRAM.
54
V_LI
Lithium Voltage Input. Connect to a lithium cell greater than V_LIMIN and no greater than V_LIMAX
as shown in the electrical specifications. Nominal value is +3V.
52
GND
Logic Ground
GENERAL-PURPOSE I/O PINS
11
P0.0/AD0
9
P0.1/AD1
7
P0.2/AD2
5
P0.3/AD3 ^{General-Purpose I/O Port 0. This port is open drain and cannot drive a logic 1. It requires}
external pullups. Port 0 is also the multiplexed expanded address/data bus. When used in this
1
P0.4/AD4 _{mode, it does not require pullups.}
79
P0.5/AD5
77
P0.6/AD6
75
P0.7/AD7
15
P1.0
17
P1.1
19
P1.2
21
P1.3
General-Purpose I/O Port 1
25
P1.4
27
P1.5
29
P1.6
31
P1.7
49
P2.0/A8
50
P2.1/A9
51
P2.2/A10
56
P2.3/A11 _{General-Purpose I/O Port 2. Also serves as the MSB of the expanded address bus.}
58
P2.4/A12
60
P2.5/A13
64
P2.6/A14
66
P2.7/A15
36
P3.0/RXD
General-Purpose I/O Port Pin 3.0. Also serves as the receive signal for the on-board UART.
This pin should not be connected directly to a PC COM port.
38
P3.1/TXD
General-Purpose I/O Port Pin 3.1. Also serves as the transmit signal for the on-board UART.
This pin should not be connected directly to a PC COM port.
39
P3.2/INT0 General-Purpose I/O Port Pin 3.2. Also serves as the active-low external interrupt 0.
40
P3.3/INT1 General-Purpose I/O Port Pin 3.3. Also serves as the active-low external interrupt 1.
41
P3.4/T0 General-Purpose I/O Port Pin 3.4. Also serves as the timer 0 input.
44
P3.5/T1 General-Purpose I/O Port Pin 3.5. Also serves as the timer 1 input.
45
P3.6/WR General-Purpose I/O Port Pin 3.6. Also serves as the write strobe for expanded bus operation.
46
P3.7/RD General-Purpose I/O Port Pin 3.7. Also serves as the read strobe for expanded bus operation.
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