MC13201 Technical Data, Rev. 1.0,

10

Freescale Semiconductor

Figure 6. RF Parametric Evaluation Circuit

6

Functional Description

The following sections provide a detailed description of the MC13201 functionality, including operating

modes, and the Serial Peripheral Interface (SPI).

6.1

MC13201 Operational Modes

The MC13201 has a number of operational modes that allow for low-current operation. Transition from

the Off to Idle mode occurs when RST is negated. Once in Idle, the SPI is active and is used to control the

IC. Transition to Hibernate and Doze modes is enabled via the SPI. These modes are summarized, along

with the transition times, in Table 7. Current drain in the various modes is listed in Table 3, DC Electrical

Characteristics.

Table 7. MC13201 Mode Definitions and Transition Times

Mode

Definition

Transition Time

To or From Idle

Off

All IC functions Off, Leakage only. RST asserted. Digital outputs are tri-stated

including IRQ

10 - 25 ms to Idle

Hibernate

Crystal Reference Oscillator Off. (SPI not functional.) IC Responds to ATTN. Data is

retained.

7 - 20 ms to Idle

Doze

Crystal Reference Oscillator On but CLKO output available only if Register 7, Bit 9 =

1 for frequencies of 1 MHz or less. (SPI not functional.) Responds to ATTN and can

be programmed to enter Idle Mode through an internal timer comparator.

(300 + 1/CLKO) µs to Idle

Idle

Crystal Reference Oscillator On with CLKO output available. SPI active.

Receive

Crystal Reference Oscillator On. Receiver On.

144 µs from Idle

Transmit

Crystal Reference Oscillator On. Transmitter On.

144 µs from Idle

L2

6.8nH

5

1

6

2

3

4

Z1

LDB212G4005C-001

L3

3.9nH

C1

1.0pF

R1

0R

R2

0R

Not Mounted

2

5

3

4

J1

SMA_edge_Receptac

C2

10pF

ANT1

F_Antenna

PAO_M

6

PAO_P

5

RFIN_P

2

RFIN_M

1

CT_Bias

3

U5

MC1320x

L1

1.8nH

L4

1.8nH